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Inter Switch Connection

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by mahesh

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Hi,

I am using Cisco EMI-3550 and 3500 XL Switch in my Nw.VLAN 2-4 is created on EMI switch and routed through Router interface and working fine.

I connected the both tghe switches with FE ports with switch port access VLAN 2 and VLAN 1(default)is shut downed.

It was working fine earlier.But one fine day link started going up and down continuously.I tryed all options and failed .....But same link is working if i am connecting both ends with central ordinary 10/100 mbps hub.

I am wondering what exactly is the problem with direct connections? I checked all combination of port speed at both end but no use..?

I am giving partial config below....
Switch 3500-XL:

interface FastEthernet0/9
switchport access vlan 2

interface VLAN1
ip address 192.168.102.205 255.255.255.0
no ip directed-broadcast
no ip route-cache

3550 EMI switch:

interface FastEthernet0/2
switchport access vlan 2
no ip address
interface Vlan1
no ip address
shutdown
!
interface Vlan2
ip address 192.168.103.250 255.255.255.0
spanning-tree portfast

interface Vlan3
ip address 192.168.107.250 255.255.255.0
spanning-tree portfast

Any Solution please.

1 reply

by mshavrov

First of all, connect your PC or 2 PCs to Console ports on both switches, turn on logging to console ("conf t", "logg cons 7"), and see what kind of error messages are you getting. Ports don't go up and down without the reason. It may be spanningtree, bad port, bad cable (do you use crossover cable?), etc. After you determine what errormessage system generates when port goes down, you may use www.cisco.com and just paste whole or part of error message in the search and see what Cisco has to say about this. If you have Cisco's CCO login, you can use Output Interpreter to parse your configs for potential problems.

If you have more details and want to follow-up, just send me e-mail.

Good luck,

Michael Shavrov
CCNP, CCDP, CCSP, Security+, MCSE W2K, MCSE+I, ...

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