So it look like this:
PC ------ R1--------fa0/2 Cat1 fa0/23-24---FEC---fa0/23-24 Cat2
You can ping both switch switches from PC in subnet 10.5.31.0/24. You
cannot ping each switches from another switch either way. Can you ping the
R1 (10.5.30.254) from Cat1? From Cat2? If you can ping the R1 from both
switches then the FEC is fine because a ping from Cat2 would have to go
through FEC. Even when the PC ping and telnet to both the switches tells
you that there connectivity between the switches. To check the FEC is
enabled both ports would have to be forwarding, I believe it would be "show
spanning tree". Check the interfaces if they are in the same vlan "show
inte fa0/23 switchport". If all else fail, try to clear the arp cache in
both switches, I found this to be the case on numerous occasions.
>From: "Lawrence Law"
>Reply-To: "Lawrence Law"
>To: [EMAIL PROTECTED]
>Subject: FEC between two Catalysts. [7:8374]
>Date: Wed, 13 Jun 2001 13:46:20 -0400
>
>Here is my case:
>********************************
>2 Catalyst 2924XL : A router(e0/1: 10.5.30.254) connected to Fa0/2 of
>Cat_1.
>Cat_1's port 23 & 24 configured FEC are connected to CAT_2's port 23 & 24.
>********************************
>CAT_1 configuration (simplified)
>!
>interface FastEthernet 0/22
>!
>interface FastEthernet 0/23
> port group 1
>!
>interface FastEthernet 0/24
> port group 1
>!
>interface VLAN1
> ip address 10.5.30.253 255.255.255.0
>
>ip default-gateway 10.5.30.254
>!
>
>********************************
>CAT_2 Configuration (simplified)
>!
>interface FastEthernet 0/22
>!
>interface FastEthernet 0/23
> port group 1
>!
>interface FastEthernet 0/24
> port group 1
>!
>interface VLAN1
> ip address 10.5.30.252 255.255.255.0
>
>ip default-gateway 10.5.30.254
>!
>********************************
>Hope the above info is enough.
>
>Problem:
>I am able to telnet both Catalysts from a PC in 10.5.31.0/24 network,
>but I can't telnet/ping from CAT_1 command line interface to CAT_2 VLAN1 ip
>or e versa.
>
>Is the problem caused by FEC between them? Any suggestion.
>
>Thanks in advance
>
>Lawrence
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