Nobody with an idea for the cause of this problem? > Hi, > > I've had some strange problem at a customer site ... setup generally > looks like this: two 3560 (call the A and B), connected to each other > via 2 port etherchannel, each of the two connected via one fiber link to > a Linksys SRW 2024 (called L). STP blocks one of the fiber links (let's > say between B and L), everything looks good on layer 2/3 ... Multiple > VLANs are in use, which are trunked between the Ciscos and the Linksys, > though only 4 VLANs are actually in use on the Linksys (the others > aren't configured). > > Now for the problem, I can't seem to get any ARP requests through from > the Cisco switches to the Linksys, at least not from anything further > than A: I can ping anything connected to L from A, though neither B nor > other hosts hooked up to A can reach anything connected to L. I did a > "debug arp" on A, and I do see the arp requests coming in. Once the > boxes connected to L actively ping (or anything else) anything hooked up > to either A or B, that destination can then reach that box as it then > has the MAC of the box (so MAC addresses seem to be learned correctly on > the Cisco switches). Doing a tcpdump on a Linux box hooked up to L > showed me no ARP requests from behind A, so there must be SOMETHING > keeping either A from forwarding the ARP requests, or L from accepting > them on the trunk link. > > As the Linksys was just hooked up replacing a 3524, without any changes > to the two 3560s, I wouldn't expect the Cisco switches to be causing > this ... especially as there isn't much to the port config anyway...: > > interface GigabitEthernet0/26 > switchport trunk encapsulation dot1q > switchport mode trunk > speed nonegotiate > > Storm Control and stuff is all disabled on the Linksys, can't really see > anything else in the config that could/should cause this kind of problem ... > > Anybody have any suggestions? > > Tnx! >
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