I have 3 348G switches connected in eiasy chain fashion on gig0/0 and gig0/1 ports. My problem is that when I do "show cdp neighbor" command, it show switch seeing itself on some of fastethernet ports. fastethernet ports are all connected PCs. the closet is wired with old type 1 cable for token ring, but later conneverted into ethernet.
Please if any has anybody have a clue of this, let me know.
WITCHNGS2 Fas 0/24 173 S I WS-C2950G-Fas 0/24 WITCHNGS2 Fas 0/15 173 S I WS-C2950G-Fas 0/15 SWITCHNGS2 Fas 0/9 173 S I WS-C2950G-Fas 0/9 WITCHNGS2 Fas 0/8 173 S I WS-C2950G-Fas 0/8
I would say that the most reasonable explanation is that the CDP frames are somehow "reflected" back. Are you absolutely sure that on these ports (Fa0/24, Fa0/15, Fa0/8), only end hosts are connected? Is it a direct connection by cable only, or is there any device between the port and the end host, no matter how insignificant it may seem?
The only thing that is in between switch ports and end hosts is type 1 batch panel. Type 1 cables run from cubes to the patch panel in closet, then token ring to Ethernet convertor adapters and cat 5 cables are used between switch ports to patch panel.
I'm suspecting the type 1 patch panel, but then it is not happening on ports.
That would make sense. I have no practical experience with Token Ring equipment - thank you for joining in!
Nevertheless, something here confuses me: On Catalyst switches, every switchport emits LOOP frames until explicitly disabled. If a port receives a LOOP frame it has originated itself, it will be immediately put into self-looped errdisabled state. Why did not that happen in this network?
We have seen this when they use gigastack gbics and you tie them all together . Ugly setup and tough to troubleshoot and find anything including tracking down addresses . I bet if you look closely they are using this setup .
some of the switches use gigastack gbics, but this issue is also happening on those switches not using gigastack gbics. Narayan comments makes more sense. If I look those ports closely, I don't find mac addresses associated with them, yet they show line up protocol up. I'm also seeing BPDU Guard triggered on end host ports randamly and I did not find any device capable of sending BPDU, so most likely the type 1 cables and patch panel are causing loops.
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This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
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