Problem changing Vlan 1 ip address

[LEN SNEED]

Hi,

I have a 3750 stack that connects to a 3560 at another site.  The are both on the inside of our network and basically a switch to switch connection.  The switchports are in vlan 901.  When I telnet from the 3750 to the 3560 and attempt to change the 3560's vlan 1 ip address I lose connectivity and can only get it back by going to the site and consoling into the 3560 to change the vlan 1 ip address back.  The 3750 vtp mode is server and the remote 3560 is vtp transparent.  Any ideas why this is happening?

Thanks,

Len.

[Reza Sharifi]

Hi Len,

Is Vlan 1 being used for management?  If you use vlan 1 IP address to telnet and once you login in change the IP address, then you will lose connection.

HTH

Reza

[LEN SNEED]

Thanks for the reply Reza,

I was actually telnetted into 3560 via vlan 905.

When the vlan 1 ip was changed not only did the telnet connection drop all network traffic throught the 3560 stopped.

[Reza Sharifi]

So, the PC that you telent from is in vlan 905 or in vlan 1?

[LEN SNEED]

The telnet was made from 10.1.5.38 on 3750 vlan1 to 3560 10.255.254.2 which is vlan905.

3750:

int g4/0/1

switchport access vlan 901

switchport mode access

int vlan1

ip address 10.1.1.1 255.255.0.0

ip helper-address 10.1.5.20

int vlan 901

ip address 10.255.255.1 255.255.255.0

3560:

int g0/21

switchport access vlan 905

int g0/22

switchport access vlan 901

int vlan1

ip address 170.53.73.56 255.255.255.0

int vlan 901

ip address 10.255.255.2 255.255.255.0

int vlan 905

ip address 10.255.254.2 255.255.255.0

Tried to change the 3560 vlan1 ip to 10.1.255.73 255.255.0.0

[Leo Laohoo]

The telnet was made from 10.1.5.38 on 3750 vlan1 to 3560 10.255.254.2 which is vlan905.

No you didn't.  You telnet from 3750 VLAN 1 to 3560 VLAN 1 and bridged to VLAN 905.

[LEN SNEED]

So when I am on terminal server 10.1.5.38 which connects to the 3750 vlan 1 and telnet to 10.255.254.2 (vlan 905)

on the 3560 I am really telnetting to the 3560 vlan 1 bridging to 905.  Then when I changed the vlan 1 ip I would lose my connection but why would all network traffic on other vlans stop?

[Leo Laohoo]

Then when I changed the vlan 1 ip I would lose my connection but why would all network traffic on other vlans stop?

Good question.  Are you running IP Routing IOS or just IP Base?

[LEN SNEED]

IP routing.

[Reza Sharifi]

Why vlan 1 on the 3750 is on one subnet and on the 3560 a different subnet?

int vlan1

ip address 10.1.1.1 255.255.0.0

3560:

int vlan1

ip address 170.53.73.56 255.255.255.0

[LEN SNEED]

The 3560 used not to be on the inside of the firewall.  When we installed ASA's recently the 3560 was then configured to be on the inside interface.  The different vlan1 ip's were left the way they were prior to the ASA installs.

[LEN SNEED]

Reza,

Any further ideas on this issue?

Thanks,

Len.

[mlund]

Hi Len

Because we haven't seen the whole config of the switches this is a guess of what happens.

You telnet from 10.1.5.38 to 10.255.254.2 this means your traffic flows to 3750 10.1.1.1 (defaultgatewy I guess),

via routingstatements in 3750 pointing to 3560.

The return traffic goes from 3560 towards 3750, via routing and out to Your terminalserver

When You change the address on 3560 to 10.1.255.73 the return traffic towards 10.1.5.38 is now seen as local connected on 3560,

and the 3560 will just put the returntraffic out on the vlan1 interface.

Then vlan 1 must be connected through a trunk between switches, otherwise the traffic will stop.

If the above is not correct, Perhaps You can share the complete configuration.

/Mikael

[LEN SNEED]

Mikael,

Below are the outputs of the show ip route and show ip eigrp topology commands.  Two things that I have noticed are:

1- On the core 3750 the following are present for the show ip route:

             10.0.0.0/8 is variably subnetted, 104 subnets, 3 masks

    C       10.1.0.0/16 is directly connected, Vlan1

   On the remote 3560 just has '10.0.0.0/8 is variably subnetted, 56 subnets, 2 masks'.

2- On the remote 3560 the vlan 1 ip and the eigrp router-id are both 170.53.73.56

Would these have any impact when the 170.53.73.56 ip is changed to 10.1.255.73 on the 3560?

Remote 3560:

remote-3560#sh ip rout
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.255.255.1 to network 0.0.0.0

     170.53.0.0/16 is variably subnetted, 6 subnets, 3 masks
S       170.53.230.0/24 [1/0] via 10.255.254.1
S       170.53.32.0/19 [1/0] via 10.255.254.1
S       170.53.75.0/24 [1/0] via 10.255.255.1
C       170.53.73.0/24 is directly connected, Vlan1
S       170.53.72.12/32 [1/0] via 10.255.255.1
S       170.53.64.0/19 [1/0] via 10.255.254.1
     70.0.0.0/30 is subnetted, 1 subnets
D       70.63.126.128 [90/3072] via 10.255.252.1, 4d17h, Vlan902
     172.31.0.0/24 is subnetted, 1 subnets
D       172.31.255.0 [90/3072] via 10.255.253.1, 4d17h, Vlan903
     10.0.0.0/8 is variably subnetted, 56 subnets, 2 masks
D       10.9.0.0/16 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.103.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.102.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.101.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
C       10.255.253.0/24 is directly connected, Vlan903
C       10.255.252.0/24 is directly connected, Vlan902
C       10.255.255.0/24 is directly connected, Vlan901
C       10.255.254.0/24 is directly connected, Vlan905
C       10.255.251.0/24 is directly connected, Vlan904
D       10.4.0.0/16 [90/3072] via 10.255.251.1, 4d17h, Vlan904
D       10.5.0.0/16 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.113.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.112.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.109.52.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.53.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.52.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.104.6.0/24 [90/3072] via 10.255.251.1, 4d17h, Vlan904
D       10.104.7.0/24 [90/3072] via 10.255.251.1, 4d17h, Vlan904
D       10.109.15.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.104.10.0/24 [90/3072] via 10.255.251.1, 4d17h, Vlan904
D       10.109.14.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.104.11.0/24 [90/3072] via 10.255.251.1, 4d17h, Vlan904
D       10.104.8.0/24 [90/3072] via 10.255.251.1, 4d17h, Vlan904
D       10.109.11.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.15.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.104.14.0/24 [90/3072] via 10.255.251.1, 4d17h, Vlan904
D       10.109.10.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.14.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.104.15.0/24 [90/3072] via 10.255.251.1, 4d17h, Vlan904
D       10.109.22.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.23.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.22.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.255.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.193.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.192.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.109.192.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.203.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.202.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.109.202.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.163.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.162.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.161.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.109.162.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.109.161.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.171.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.109.172.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.109.171.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.173.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.172.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.109.182.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.109.181.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.183.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.182.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.105.181.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
D       10.109.191.0/24 [90/3072] via 10.255.253.1, 4d17h, Vlan903
D       10.105.191.0/24 [90/3072] via 10.255.252.1, 4d17h, Vlan902
S*   0.0.0.0/0 [1/0] via 10.255.255.1
MCH-3560#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(100)/ID(170.53.73.56)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 10.4.0.0/16, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.109.52.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.104.15.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.105.172.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.181.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.14.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 170.53.32.0/19, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 170.53.64.0/19, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.105.255.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.191.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.5.0.0/16, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.192.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.22.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.193.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 170.53.75.0/24, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.105.103.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.104.10.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.105.52.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.104.6.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.109.161.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.109.171.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.109.162.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 170.53.72.12/32, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.105.22.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.163.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 172.31.255.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.23.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.112.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.255.252.0/24, 1 successors, FD is 2816
        via Connected, Vlan902
P 10.9.0.0/16, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 70.63.126.128/30, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.255.254.0/24, 1 successors, FD is 2816
        via Connected, Vlan905
P 10.105.102.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 170.53.230.0/24, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.255.253.0/24, 1 successors, FD is 2816
        via Connected, Vlan903
P 10.255.251.0/24, 1 successors, FD is 2816
        via Connected, Vlan904
P 10.105.203.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.255.255.0/24, 1 successors, FD is 2816
        via Connected, Vlan901
P 10.109.181.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.104.14.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 0.0.0.0/0, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.105.182.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.104.8.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.109.11.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.104.11.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.105.101.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.192.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.162.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.172.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.191.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.15.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.53.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.171.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.202.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.173.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.15.0/24, 1 successors, FD is 3072
       via 10.255.253.1 (3072/2816), Vlan903
P 10.105.183.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.113.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.10.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.104.7.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.109.182.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.109.202.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.161.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.14.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902

remote-3560#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(100)/ID(170.53.73.56)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 10.4.0.0/16, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.109.52.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.104.15.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.105.172.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.181.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.14.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 170.53.32.0/19, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 170.53.64.0/19, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.105.255.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.191.0/24, 1 successors, FD is 3072
         via 10.255.253.1 (3072/2816), Vlan903
P 10.5.0.0/16, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.192.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.22.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.193.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 170.53.75.0/24, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.105.103.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.104.10.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.105.52.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.104.6.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.109.161.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.109.171.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.109.162.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 170.53.72.12/32, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.105.22.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.163.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 172.31.255.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.23.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.112.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.255.252.0/24, 1 successors, FD is 2816
        via Connected, Vlan902
P 10.9.0.0/16, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 70.63.126.128/30, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.255.254.0/24, 1 successors, FD is 2816
        via Connected, Vlan905
P 10.105.102.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 170.53.230.0/24, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.255.253.0/24, 1 successors, FD is 2816
        via Connected, Vlan903
P 10.255.251.0/24, 1 successors, FD is 2816
        via Connected, Vlan904
P 10.105.203.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.255.255.0/24, 1 successors, FD is 2816
        via Connected, Vlan901
P 10.109.181.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.104.14.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 0.0.0.0/0, 1 successors, FD is 28160
        via Rstatic (28160/0)
P 10.105.182.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.104.8.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.109.11.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.104.11.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.105.101.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.192.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.162.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.172.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.191.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.15.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.53.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.171.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.202.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.173.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.15.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.183.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.113.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.109.10.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.104.7.0/24, 1 successors, FD is 3072
        via 10.255.251.1 (3072/2816), Vlan904
P 10.109.182.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.109.202.0/24, 1 successors, FD is 3072
        via 10.255.253.1 (3072/2816), Vlan903
P 10.105.161.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902
P 10.105.14.0/24, 1 successors, FD is 3072
        via 10.255.252.1 (3072/2816), Vlan902

Core 3750:

Core-3750G-1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is 10.255.1.2 to network 0.0.0.0

     170.53.0.0/16 is variably subnetted, 6 subnets, 3 masks
D EX    170.53.230.0/24 [170/28416] via 10.255.255.2, 4d17h, Vlan901
D EX    170.53.32.0/19 [170/28416] via 10.255.255.2, 4d17h, Vlan901
D EX    170.53.75.0/24 [170/28416] via 10.255.255.2, 4d17h, Vlan901
S       170.53.72.12/32 [1/0] via 10.255.1.2
D EX    170.53.64.0/19 [170/28416] via 10.255.255.2, 4d17h, Vlan901
S       170.53.75.35/32 [1/0] via 10.255.1.2
     70.0.0.0/30 is subnetted, 1 subnets
D       70.63.126.128 [90/3328] via 10.255.255.2, 4d17h, Vlan901
     172.31.0.0/24 is subnetted, 1 subnets
D       172.31.255.0 [90/3328] via 10.255.255.2, 4d17h, Vlan901
     10.0.0.0/8 is variably subnetted, 104 subnets, 3 masks
C       10.101.111.0/24 is directly connected, Vlan111
C       10.101.109.0/24 is directly connected, Vlan109
C       10.101.108.0/24 is directly connected, Vlan108
D       10.9.0.0/16 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.103.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.107.0/24 is directly connected, Vlan107
D       10.105.102.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.106.0/24 is directly connected, Vlan106
D       10.105.101.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.255.253.0/24 [90/3072] via 10.255.255.2, 4d17h, Vlan901
C       10.101.103.0/24 is directly connected, Vlan103
D       10.255.252.0/24 [90/3072] via 10.255.255.2, 4d17h, Vlan901
C       10.101.102.0/24 is directly connected, Vlan102
C       10.2.1.0/24 is directly connected, Vlan12
C       10.255.255.0/24 is directly connected, Vlan901
C       10.101.101.0/24 is directly connected, Vlan101
D       10.255.254.0/24 [90/3072] via 10.255.255.2, 4d17h, Vlan901

***************************************************
C       10.1.0.0/16 is directly connected, Vlan1
***************************************************

D       10.255.251.0/24 [90/3072] via 10.255.255.2, 4d17h, Vlan901
D       10.4.0.0/16 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.5.0.0/16 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.113.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.112.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.113.0/24 is directly connected, Vlan113
C       10.101.112.0/24 is directly connected, Vlan112
C       10.101.69.0/24 is directly connected, Vlan69
C       10.101.68.0/24 is directly connected, Vlan68
C       10.101.67.0/24 is directly connected, Vlan67
C       10.101.66.0/24 is directly connected, Vlan66
C       10.101.92.0/24 is directly connected, Vlan92
C       10.101.91.0/24 is directly connected, Vlan91
C       10.101.89.0/24 is directly connected, Vlan89
C       10.101.88.0/24 is directly connected, Vlan88
C       10.101.87.0/24 is directly connected, Vlan87
C       10.101.86.0/24 is directly connected, Vlan86
C       10.101.39.0/24 is directly connected, Vlan39
C       10.101.38.0/24 is directly connected, Vlan38
C       10.101.37.0/24 is directly connected, Vlan37
C       10.101.36.0/24 is directly connected, Vlan36
D       10.109.52.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.53.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.52.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.15.0/24 is directly connected, Vlan15
C       10.101.14.0/24 is directly connected, Vlan14
D       10.104.6.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.104.7.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.9.0/24 is directly connected, Vlan9
D       10.109.15.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.104.10.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.14.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.104.11.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.104.8.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.11.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.15.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.104.14.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.10.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.14.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.104.15.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.22.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.23.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.22.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.255.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.193.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.192.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.203.0/24 is directly connected, Vlan203
C       10.101.202.0/24 is directly connected, Vlan202
C       10.101.201.0/24 is directly connected, Vlan201
D       10.109.192.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.203.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.202.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.202.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.193.0/24 is directly connected, Vlan193
C       10.101.192.0/24 is directly connected, Vlan192
D       10.105.163.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.162.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.161.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.173.0/24 is directly connected, Vlan173
C       10.101.172.0/24 is directly connected, Vlan172
C       10.101.171.0/24 is directly connected, Vlan171
D       10.109.162.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.161.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.171.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.172.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.171.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.163.0/24 is directly connected, Vlan163
C       10.101.162.0/24 is directly connected, Vlan162
D       10.105.173.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.161.0/24 is directly connected, Vlan161
D       10.105.172.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.191.0/24 is directly connected, Vlan191
D       10.109.182.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.181.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.183.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
--More--                           D       10.105.182.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.105.181.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
D       10.109.191.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.101.183.0/24 is directly connected, Vlan183
C       10.101.182.0/24 is directly connected, Vlan182
C       10.101.181.0/24 is directly connected, Vlan181
D       10.105.191.0/24 [90/3328] via 10.255.255.2, 4d17h, Vlan901
C       10.255.1.0/29 is directly connected, Vlan900
C       10.101.153.0/24 is directly connected, Vlan153
C       10.101.152.0/24 is directly connected, Vlan152
C       10.101.151.0/24 is directly connected, Vlan151
S*   0.0.0.0/0 [1/0] via 10.255.1.2
DC-3750G-1#sh ip eigrp topology
EIGRP-IPv4 Topology Table for AS(100)/ID(10.255.255.1)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 10.4.0.0/16, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.52.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.104.15.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.172.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.181.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.14.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 170.53.32.0/19, 1 successors, FD is 28416
        via 10.255.255.2 (28416/28160), Vlan901
P 170.53.64.0/19, 1 successors, FD is 28416
        via 10.255.255.2 (28416/28160), Vlan901
P 10.105.255.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 10.109.191.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.5.0.0/16, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.192.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.22.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.193.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 170.53.75.0/24, 1 successors, FD is 28416
        via 10.255.255.2 (28416/28160), Vlan901
P 10.105.103.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.104.10.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.52.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.104.6.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.161.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.171.0/24, 1 successors, FD is 3328
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.162.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 170.53.72.12/32, 0 successors, FD is Inaccessible
        via 10.255.255.2 (28416/28160), Vlan901
P 10.105.22.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.163.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 172.31.255.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.23.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.112.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.255.252.0/24, 1 successors, FD is 3072
        via 10.255.255.2 (3072/2816), Vlan901
P 10.9.0.0/16, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 70.63.126.128/30, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.255.254.0/24, 1 successors, FD is 3072
        via 10.255.255.2 (3072/2816), Vlan901
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 10.105.102.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 170.53.230.0/24, 1 successors, FD is 28416
        via 10.255.255.2 (28416/28160), Vlan901
P 10.255.253.0/24, 1 successors, FD is 3072
        via 10.255.255.2 (3072/2816), Vlan901
P 10.255.251.0/24, 1 successors, FD is 3072
        via 10.255.255.2 (3072/2816), Vlan901
P 10.105.203.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.255.255.0/24, 1 successors, FD is 2816
        via Connected, Vlan901
P 10.109.181.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.104.14.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 0.0.0.0/0, 0 successors, FD is Inaccessible
        via 10.255.255.2 (28416/28160), Vlan901
P 10.105.182.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.104.8.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.11.0/24, 1 successors, FD is 3328
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

        via 10.255.255.2 (3328/3072), Vlan901
P 10.104.11.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.101.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.192.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.162.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.172.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.191.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.15.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.53.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.171.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.202.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.173.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 10.109.15.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.183.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.113.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.10.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.104.7.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.182.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.109.202.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.161.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901
P 10.105.14.0/24, 1 successors, FD is 3328
        via 10.255.255.2 (3328/3072), Vlan901

[Leo Laohoo]

Hmmm ... If VLAN 1 and 905 have an IP address, what is the default-gateway IP address?  Is this in the same subnet as VLAN 1?