LAN Mess

Ricky S · ‎07-10-2012

Hi folks, we recently acquired a new company and I am trying to get my head wrapped around their network setup until I physically go out there to refresh the network.

I have a bit of a trivial situation and am wandering if someone can help me out.

I have 2 switches: Switch 4 and Switch 5 which are connected to one another over a trunk link

Switch 4 has Gi1/0/2 and Gi1/0/3 attached to a database server via a port channel (Po1). Server IP address is 192.168.218.19

Default Gateway for Switch 4 is Switch 5

When I do a traceroute to 192.168.218.19 from Switch4, trace goes to Switch 5 and then to 192.168.218.19

When I do show mac address-table address command on the MAC address of 192.168.218.19 on Switch 5, it says its connected to Gi1/0/1. Gi1/0/1 is connected to Switch4

When I go back to Switch4 and look up the MAC for 192.168.218.19, it says connected via Po1.

The database server has two NICs connecting to Switch 4 and two Connecting to Switch 5 for backup.

This causes a problem when I have a device connecting directly into Switch 4 and wants to send a file to the database server. It first goes from Switch 4 to Switch 5, then back over the trunk to Switch 4 and to the Po1.

Switch5 must stay as the default gateway for switch 4 as it's got further connectivity into the WAN from Switch 5.

Please advise how I can fix this?

Ricky S · ‎07-10-2012

Below is an output of basically everything that I talk about in my previous post, in Cisco's language

Username: xxxx

Password:

SW4>

SW4>en

Password:

SW4#

SW4#traceroute 192.168.218.19

Type escape sequence to abort.

Tracing the route to 192.168.218.19

1 172.18.6.16 0 msec 0 msec 0 msec

2 192.168.218.19 0 msec 0 msec 8 msec

SW4#

SW4#172.18.6.16

Trying 172.18.6.16 ... Open

User Access Verification

Username: xxxxxxxxx

Password:

SW5>en

Password:

SW5#

SW5#sh arp | inc 192.168.218.19

Internet 192.168.218.19 121 0060.163e.49bf ARPA Vlan2

SW5#

SW5#sh mac address-table address 0060.163e.49bf

Mac Address Table

-------------------------------------------

Vlan Mac Address Type Ports

---- ----------- -------- -----

2 0060.163e.49bf DYNAMIC Gi1/0/1

Total Mac Addresses for this criterion: 1

SW5#

SW5#sh cdp nei

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone

Device ID Local Intrfce Holdtme Capability Platform Port ID

SW3 Gig 1/0/18 176 S I WS-C2960G Gig 0/2

SW3 Gig 1/0/20 176 S I WS-C2960G Gig 0/1

SW4 Gig 1/0/2 149 S I WS-C3750G Gig 1/0/1

SW4 Gig 1/0/1 154 S I WS-C3750G Gig 1/0/2

SW5#sh run int gig1/0/1

interface GigabitEthernet1/0/1

description etherchanne to SW4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

end

SW5#sh run int gig1/0/2

interface GigabitEthernet1/0/2

description etherchanne to SW4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

end

SW5#

SW5#sh run int po3

interface Port-channel3

switchport trunk encapsulation dot1q

switchport mode trunk

end

SW5#

SW5#exit

[Connection to 172.18.6.16 closed by foreign host]

SW4#

SW4#sh mac address-table address 0060.163e.49bf

Mac Address Table

-------------------------------------------

Vlan Mac Address Type Ports

---- ----------- -------- -----

2 0060.163e.49bf DYNAMIC Po5

1 0060.163e.49bf DYNAMIC Po5

Total Mac Addresses for this criterion: 2

SW4#

SW4#sh etherchannel summary

Flags: D - down P - in port-channel

I - stand-alone s - suspended

H - Hot-standby (LACP only)

R - Layer3 S - Layer2

U - in use f - failed to allocate aggregator

u - unsuitable for bundling

w - waiting to be aggregated

d - default port

Number of channel-groups in use: 4

Number of aggregators: 4

Group Port-channel Protocol Ports

------+-------------+-----------+-----------------------------------------------

1 Po1(SD) LACP Gi1/0/24(I)

2 Po2(SD) -

3 Po3(SU) LACP Gi1/0/1(P)

5 Po5(SU) LACP Gi1/0/3(P) Gi1/0/4(P)

SW4#sh run int gi1/0/3

Building configuration...

Current configuration : 157 bytes

!

interface GigabitEthernet1/0/3

description EMC_Active cge1

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 5 mode active

end

SW4#sh run int gi1/0/4

Building configuration...

Current configuration : 157 bytes

!

interface GigabitEthernet1/0/4

description EMC_Active cge2

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 5 mode active

end

SW4#sh run int po5

Building configuration...

Current configuration : 92 bytes

!

interface Port-channel5

switchport trunk encapsulation dot1q

switchport mode trunk

end

Aileron88 · ‎07-10-2012

Hi,

Could you provide a diagram of this setup? What switches are you using?

Adam

Ricky S · ‎07-10-2012

Hi Adam, I quickly created a drawing as per your note. It's not a master-piece but it sort of will help put things into perspective.

ORANGE lines and arrows show how traffic flows from a client to the server currently.

GREEN lines and arrows show how it should be flowing.

cadet alain · ‎07-11-2012

Hi,

Can you provide your running from sw4 and sw5 as well as ip config from client and server.

Regards.

Alain

Don't forget to rate helpful posts.

Ricky S · ‎07-13-2012

Hi Alain, here are the configs. Thanks.

SWITCH 4

SW4#sh run

Building configuration...

Current configuration : 3537 bytes

!

version 12.2

no service pad

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname SW4

!

enable secret xxxxxxxxx

!

username xxxxxxxxx password xxxxxxxxxxx

no aaa new-model

clock timezone UTC -5

clock summer-time UTC recurring

switch 1 provision ws-c3750g-24t

system mtu routing 1500

ip subnet-zero

!

no file verify auto

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

interface Port-channel1

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel2

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel3

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel5

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface GigabitEthernet1/0/1

description etherchannel to SW5

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

!

interface GigabitEthernet1/0/2

description etherchannel to SW5

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface GigabitEthernet1/0/3

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 5 mode active

!

interface GigabitEthernet1/0/4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 5 mode active

!

interface GigabitEthernet1/0/5

switchport access vlan 7

switchport mode access

!

interface GigabitEthernet1/0/6

switchport access vlan 7

switchport mode access

!

interface GigabitEthernet1/0/7

switchport access vlan 7

!

interface GigabitEthernet1/0/8

switchport access vlan 7

!

interface GigabitEthernet1/0/9

switchport access vlan 2

!

interface GigabitEthernet1/0/10

description RemusSQL_Lan

switchport access vlan 17

!

interface GigabitEthernet1/0/11

switchport mode access

!

interface GigabitEthernet1/0/12

switchport trunk encapsulation dot1q

switchport mode access

!

interface GigabitEthernet1/0/13

!

interface GigabitEthernet1/0/14

!

interface GigabitEthernet1/0/15

switchport access vlan 6

!

interface GigabitEthernet1/0/16

switchport mode access

!

interface GigabitEthernet1/0/17

description Romulus_Lan

switchport access vlan 17

!

interface GigabitEthernet1/0/18

!

interface GigabitEthernet1/0/19

description Cleito_ILO

!

interface GigabitEthernet1/0/20

!

interface GigabitEthernet1/0/21

!

interface GigabitEthernet1/0/22

!

interface GigabitEthernet1/0/23

description From Firewall

switchport mode access

!

interface GigabitEthernet1/0/24

description Trunk to Swich 2

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 1 mode active

!

interface Vlan1

ip address 172.18.6.14 255.255.255.0

no ip route-cache

!

interface Vlan6

ip address 192.168.216.2 255.255.255.0

!

interface Vlan7

ip address 192.168.217.2 255.255.255.0

!

interface Vlan17

ip address 192.168.215.2 255.255.255.0

!

ip default-gateway 172.18.6.16

ip classless

ip http server

!

control-plane

!

line con 0

!

end

**********************************************************************

SWITCH5

**********************************************************************

SW5#sh run

Building configuration...

Current configuration : 5534 bytes

!

version 12.2

no service pad

service timestamps debug uptime

service timestamps log datetime localtime

no service password-encryption

!

hostname SW5

!

enable secret xxxxxxxxxxxx

!

no aaa new-model

clock timezone UTC -6

clock summer-time UTC recurring

switch 1 provision ws-c3750g-24t

system mtu routing 1500

ip subnet-zero

ip routing

!

no file verify auto

spanning-tree mode pvst

spanning-tree extend system-id

!

vlan internal allocation policy ascending

!

interface Port-channel1

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel2

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel3

switchport trunk encapsulation dot1q

switchport mode trunk

!

interface Port-channel4

switchport trunk encapsulation dot1q

switchport mode access

!

interface GigabitEthernet1/0/1

description etherchanne to SW4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

!

interface GigabitEthernet1/0/2

description etherchanne to SW4

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 3 mode active

!

interface GigabitEthernet1/0/3

description EMC_Standby cge1

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 2 mode active

!

interface GigabitEthernet1/0/4

description EMC_Standby cge2

switchport trunk encapsulation dot1q

switchport mode trunk

channel-group 2 mode active

!

interface GigabitEthernet1/0/5

description EMC_Data1 cge0 - Active (Server_2)

switchport access vlan 6

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/6

description EMC_Data1 cge0 - Active (Server_3)

switchport access vlan 6

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/7

description EMC_Data1 RemusSQL (Teamed)

switchport access vlan 6

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/8

description EMC_Data1 RemusSQL (Teamed)

switchport access vlan 6

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/9

description EMC_Cifs

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/10

description RemusSQL_Lan

switchport access vlan 17

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/11

description EMC_Cifs

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/12

description EMC_Backup Cleito (to be configured)

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/13

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/14

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/15

description Cleito

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/16

description Cleito

switchport access vlan 7

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/17

description Romulus_Lan

switchport access vlan 17

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/18

switchport trunk encapsulation dot1q

switchport mode access

channel-group 4 mode active

spanning-tree portfast

!

interface GigabitEthernet1/0/19

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/20

switchport trunk encapsulation dot1q

switchport mode access

channel-group 4 mode active

spanning-tree portfast

!

interface GigabitEthernet1/0/21

description EMC Management Port

switchport access vlan 17

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/22

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/23

description Despina

switchport mode access

spanning-tree portfast

!

interface GigabitEthernet1/0/24

switchport mode access

spanning-tree portfast

!

interface Vlan1

ip address 172.18.6.16 255.255.255.0

!

interface Vlan2

ip address 192.168.218.1 255.255.255.0

!

interface Vlan3

ip address 192.168.219.1 255.255.255.0

!

interface Vlan4

ip address 192.168.220.1 255.255.255.0

!

interface Vlan5

ip address 192.168.221.1 255.255.255.0

!

interface Vlan6

ip address 192.168.216.1 255.255.255.0

!

interface Vlan7

ip address 192.168.217.1 255.255.255.0

!

interface Vlan12

ip address 192.168.224.1 255.255.255.0

!

interface Vlan15

ip address 192.168.227.1 255.255.255.0

!

interface Vlan17

ip address 192.168.215.1 255.255.255.0

!

interface Vlan900

ip address 10.11.6.1 255.255.255.0

!

ip default-gateway 172.18.6.1

ip classless

ip route 0.0.0.0 0.0.0.0 172.18.6.1

ip route 10.0.0.0 255.0.0.0 172.18.6.2

ip route 172.16.0.0 255.248.0.0 172.18.6.2

ip route 192.168.0.0 255.255.0.0 172.18.6.2

ip http server

!

ip access-list extended wireless

deny ip 10.11.6.0 0.0.0.255 172.18.0.0 0.0.255.255

deny ip 10.11.6.0 0.0.0.255 192.168.0.0 0.0.255.255

permit ip 10.11.6.0 0.0.0.255 any

!

access-list 5 permit 172.18.120.0 0.0.0.255

!

control-plane

!

end

Ricky S · ‎07-11-2012

Hi Adam, I forgot to mention Switch models....they are both WS-C3750G-24T