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3750x -24s not forwarding packets

terry.bell
Level 1
Level 1

‎03-02-2013 12:17 PM - edited ‎03-07-2019 12:01 PM

We have a 3750x 24s acting as a root switch for about 10 other

3750x's. Everything else seems fine, but the device stopped forwarding

packets to the applied static route.

output from show ip int brief

root-switch#show ip int brief

Interface              IP-Address      OK? Method Status                Protocol

Vlan1                  unassigned      YES NVRAM  administratively down down

Vlan2                  172.25.202.11   YES NVRAM  up                    up

Vlan3                  172.25.203.11   YES NVRAM  up                    up

Vlan4                  172.25.204.11   YES NVRAM  up                    up

Vlan5                  172.25.205.11   YES NVRAM  up                    up

Vlan6                  172.25.206.11   YES NVRAM  up                    up

Vlan7                  172.25.207.11   YES NVRAM  up                    up

Vlan8                  172.25.208.11   YES NVRAM  up                    up

Vlan9                  172.25.209.11   YES NVRAM  up                    up

Vlan15                 172.25.215.11   YES NVRAM  up                    up

Vlan201                172.25.201.11   YES NVRAM  up                    up

FastEthernet0          172.25.200.201  YES NVRAM  down                  down

GigabitEthernet1/0/1   unassigned      YES unset  down                  down

GigabitEthernet1/0/2   unassigned      YES unset  up                    up

GigabitEthernet1/0/3   unassigned      YES unset  up                    up

GigabitEthernet1/0/4   unassigned      YES unset  up                    up

GigabitEthernet1/0/5   unassigned      YES unset  up                    up

GigabitEthernet1/0/6   unassigned      YES unset  up                    up

GigabitEthernet1/0/7   unassigned      YES unset  up                    up

GigabitEthernet1/0/8   unassigned      YES unset  up                    up

GigabitEthernet1/0/9   unassigned      YES unset  up                    up

GigabitEthernet1/0/10  unassigned      YES unset  down                  down

GigabitEthernet1/0/11  unassigned      YES unset  down                  down

GigabitEthernet1/0/12  unassigned      YES unset  down                  down

GigabitEthernet1/0/13  unassigned      YES unset  down                  down

GigabitEthernet1/0/14  unassigned      YES unset  down                  down

GigabitEthernet1/0/15  unassigned      YES unset  up                    up

GigabitEthernet1/0/16  unassigned      YES unset  down                  down

GigabitEthernet1/0/17  unassigned      YES unset  down                  down

GigabitEthernet1/0/18  unassigned      YES unset  down                  down

GigabitEthernet1/0/19  unassigned      YES unset  down                  down

GigabitEthernet1/0/20  unassigned      YES unset  up                    up

GigabitEthernet1/0/21  unassigned      YES unset  down                  down

GigabitEthernet1/0/22  unassigned      YES unset  down                  down

GigabitEthernet1/0/23  unassigned      YES unset  down                  down

GigabitEthernet1/0/24  unassigned      YES unset  down                  down

GigabitEthernet1/1/1   172.25.230.2    YES NVRAM  up                    up

GigabitEthernet1/1/2   unassigned      YES unset  down                  down

GigabitEthernet1/1/3   unassigned      YES unset  down                  down

GigabitEthernet1/1/4   unassigned      YES unset  up                    up

Te1/1/1                unassigned      YES unset  down                  down

Te1/1/2                unassigned      YES unset  down                  down

root-switch#show route

root-switch#show ip route
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 172.25.230.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 172.25.230.1
      172.25.0.0/16 is variably subnetted, 22 subnets, 3 masks
C        172.25.201.0/24 is directly connected, Vlan201
L        172.25.201.11/32 is directly connected, Vlan201
C        172.25.202.0/24 is directly connected, Vlan2
L        172.25.202.11/32 is directly connected, Vlan2
C        172.25.203.0/24 is directly connected, Vlan3
L        172.25.203.11/32 is directly connected, Vlan3
C        172.25.204.0/24 is directly connected, Vlan4
L        172.25.204.11/32 is directly connected, Vlan4
C        172.25.205.0/24 is directly connected, Vlan5
L        172.25.205.11/32 is directly connected, Vlan5
C        172.25.206.0/24 is directly connected, Vlan6
L        172.25.206.11/32 is directly connected, Vlan6
C        172.25.207.0/24 is directly connected, Vlan7
L        172.25.207.11/32 is directly connected, Vlan7
C        172.25.208.0/24 is directly connected, Vlan8
L        172.25.208.11/32 is directly connected, Vlan8
C        172.25.209.0/24 is directly connected, Vlan9
L        172.25.209.11/32 is directly connected, Vlan9
C        172.25.215.0/24 is directly connected, Vlan15
L        172.25.215.11/32 is directly connected, Vlan15
C        172.25.230.0/25 is directly connected, GigabitEthernet1/1/1
L        172.25.230.2/32 is directly connected, GigabitEthernet1/1/1
root-switch#

root-switch#show ip int brief
Interface              IP-Address      OK? Method Status                Protocol
Vlan1                  unassigned      YES NVRAM  administratively down down
Vlan2                  172.25.202.11   YES NVRAM  up                    up
Vlan3                  172.25.203.11   YES NVRAM  up                    up
Vlan4                  172.25.204.11   YES NVRAM  up                    up
Vlan5                  172.25.205.11   YES NVRAM  up                    up
Vlan6                  172.25.206.11   YES NVRAM  up                    up
Vlan7                  172.25.207.11   YES NVRAM  up                    up
Vlan8                  172.25.208.11   YES NVRAM  up                    up
Vlan9                  172.25.209.11   YES NVRAM  up                    up
Vlan15                 172.25.215.11   YES NVRAM  up                    up
Vlan201                172.25.201.11   YES NVRAM  up                    up
FastEthernet0          172.25.200.201  YES NVRAM  down                  down
GigabitEthernet1/0/1   unassigned      YES unset  down                  down
GigabitEthernet1/0/2   unassigned      YES unset  up                    up
GigabitEthernet1/0/3   unassigned      YES unset  up                    up
GigabitEthernet1/0/4   unassigned      YES unset  up                    up
GigabitEthernet1/0/5   unassigned      YES unset  up                    up
GigabitEthernet1/0/6   unassigned      YES unset  up                    up
GigabitEthernet1/0/7   unassigned      YES unset  up                    up
GigabitEthernet1/0/8   unassigned      YES unset  up                    up
GigabitEthernet1/0/9   unassigned      YES unset  up                    up
GigabitEthernet1/0/10  unassigned      YES unset  down                  down
GigabitEthernet1/0/11  unassigned      YES unset  down                  down
GigabitEthernet1/0/12  unassigned      YES unset  down                  down
GigabitEthernet1/0/13  unassigned      YES unset  down                  down
GigabitEthernet1/0/14  unassigned      YES unset  down                  down
GigabitEthernet1/0/15  unassigned      YES unset  up                    up
GigabitEthernet1/0/16  unassigned      YES unset  down                  down
GigabitEthernet1/0/17  unassigned      YES unset  down                  down
GigabitEthernet1/0/18  unassigned      YES unset  down                  down
GigabitEthernet1/0/19  unassigned      YES unset  down                  down
GigabitEthernet1/0/20  unassigned      YES unset  up                    up
GigabitEthernet1/0/21  unassigned      YES unset  down                  down
GigabitEthernet1/0/22  unassigned      YES unset  down                  down
GigabitEthernet1/0/23  unassigned      YES unset  down                  down
GigabitEthernet1/0/24  unassigned      YES unset  down                  down
GigabitEthernet1/1/1   172.25.230.2    YES NVRAM  up                    up
GigabitEthernet1/1/2   unassigned      YES unset  down                  down
GigabitEthernet1/1/3   unassigned      YES unset  down                  down
GigabitEthernet1/1/4   unassigned      YES unset  up                    up
Te1/1/1                unassigned      YES unset  down                  down
Te1/1/2                unassigned      YES unset  down                  down

output from show ip route

root-switch#show route

root-switch#show ip route
Codes: L - local, 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, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 172.25.230.1 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 172.25.230.1
      172.25.0.0/16 is variably subnetted, 22 subnets, 3 masks
C        172.25.201.0/24 is directly connected, Vlan201
L        172.25.201.11/32 is directly connected, Vlan201
C        172.25.202.0/24 is directly connected, Vlan2
L        172.25.202.11/32 is directly connected, Vlan2
C        172.25.203.0/24 is directly connected, Vlan3
L        172.25.203.11/32 is directly connected, Vlan3
C        172.25.204.0/24 is directly connected, Vlan4
L        172.25.204.11/32 is directly connected, Vlan4
C        172.25.205.0/24 is directly connected, Vlan5
L        172.25.205.11/32 is directly connected, Vlan5
C        172.25.206.0/24 is directly connected, Vlan6
L        172.25.206.11/32 is directly connected, Vlan6
C        172.25.207.0/24 is directly connected, Vlan7
L        172.25.207.11/32 is directly connected, Vlan7
C        172.25.208.0/24 is directly connected, Vlan8
L        172.25.208.11/32 is directly connected, Vlan8
C        172.25.209.0/24 is directly connected, Vlan9
L        172.25.209.11/32 is directly connected, Vlan9
C        172.25.215.0/24 is directly connected, Vlan15
L        172.25.215.11/32 is directly connected, Vlan15
C        172.25.230.0/25 is directly connected, GigabitEthernet1/1/1
L        172.25.230.2/32 is directly connected, GigabitEthernet1/1/1
root-switch#

It feels like I'm missing something obvious, just not sure what.

Any help appreciated.

thanx

tb

Labels:
0 Helpful
3 Replies 3

Wilson Bonilla
Level 3
Level 3

‎03-02-2013 02:21 PM

Hello

Based on the output you set the switch to send any unknown traffic to

172.25.230.1 which is upstream Gig1/1/1, this interface shows up up.

How did you determine the switch stopped forwarding packets?

Regards.

Wilson B

0 Helpful

Reza Sharifi
Hall of Fame
Hall of Fame

‎03-02-2013 02:34 PM

Do you have redundant core switches or just one?

Are the access switches connected to the root-switch via 2 links?

What is the output of "sh spann"?

HTH

0 Helpful

terry.bell
Level 1
Level 1

‎03-03-2013 06:33 AM

Sorry, a co-worker re-wrote the sub-net mask from 255.255.128.0 to 255.255.255.128.0.

Our interior network is a class B. I have it split right now, the lower half being production,

and the upper half I'm using to emulate and test our new network before roll-out.

172.25.230.1 is the interior address of our firewall.

thanx

tb    

0 Helpful
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