09-17-2014 09:55 AM - edited 03-04-2019 11:46 PM
I have 2 3750s supporting a building. They have a direct link betwixt them with a vlan range trunk allowed over this link. Some of the vlan interfaces are not seeing each other and I have no idea why. This is a common config on our environment but this setup is giving me problems. one router can see the a test device in arp the other cannot. The standby shows some HSRP vlan pairs a couple report 'unknown' and each reporting themselves as Active:LOCAL. Shutting down one side does not force traffic flow.
This what I get from a switch with a link to each router. .49 being the HSRP ghost addr.
I'm not understanding how one vlan interface works fine while others do not even through they are in the same trunk vlan range and config'd the same. Ideas?
jb
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.152.27.49, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
sw1#ping 10.152.27.50
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.152.27.50, timeout is 2 seconds:
U.U.U
Success rate is 0 percent (0/5)
sw1#ping 10.152.27.51
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.152.27.51, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/4/9 ms
09-17-2014 01:03 PM
Hi,
Not 100% sure about your topology and it depends on how you have thinks set up:
Post your topology and we should be able to help more.
09-17-2014 04:01 PM
Hi,
Its interesting that the HSRP are reporting active/active. If HSRP is configured correctly, this means the link between the vlans is incorrect in some way.
I'd check the cabling physically between the switches, then compare the trunk interfaces on either side, and also checking the configuration/status of the vlans in question.
Hope this Helps
Simon
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