Hi,
We have a (standard) setup where we have 2 distribution layer switches interconnected with a L3 link and an access switch uplinked to both DL's. We run GLBP on the DL's for the VLANs hosted on the access switch. This works fine, but we get HOSTFLAPPING errors on the access switch related to GLBP MAC addressed (MAC Address of the Active AVG). I don't think this is a problem, but the error messages are filling up the logs.. any advice or suggestions?
Thanks!
error on the access-switch (gi1/3 and 2/3 are the uplinks):
2246717: Mar 3 08:41:47 GMT: %C4K_EBM-4-HOSTFLAPPING: Host 00:1C:F6:AA:00:00 in vlan 112 is flapping between port Gi2/3 and port Gi1/3
show glbp output of first distribution switch:
Vlan112 - Group 112
State is Active
5 state changes, last state change 13w1d
Virtual IP address is 10.116.12.1
Hello time 250 msec, hold time 750 msec
Next hello sent in 0.218 secs
Redirect time 600 sec, forwarder time-out 14400 sec
Preemption enabled, min delay 300 sec
Active is local
Standby is 10.116.12.3, priority 100 (expires in 0.638 sec)
Priority 110 (configured)
Weighting 100 (default 100), thresholds: lower 1, upper 100
Load balancing: round-robin
Group members:
001c.f6a9.f800 (10.116.12.3) authenticated
001c.f6aa.0000 (10.116.12.2) local
There are 2 forwarders (1 active)
Forwarder 1
State is Active
3 state changes, last state change 13w1d
MAC address is 0007.b400.7001 (default)
Owner ID is 001c.f6aa.0000
Redirection enabled
Preemption enabled, min delay 300 sec
Active is local, weighting 100
Arp replies sent: 156963
Forwarder 2
State is Listen
6 state changes, last state change 6w4d
MAC address is 0007.b400.7002 (learnt)
Owner ID is 001c.f6a9.f800
Redirection enabled, 599.884 sec remaining (maximum 600 sec)
Time to live: 14399.884 sec (maximum 14400 sec)
Preemption enabled, min delay 300 sec
Active is 10.116.12.3 (primary), weighting 100 (expires in 0.634 sec)
Arp replies sent: 156962
show glbp output of 2nd distribution switch:
Vlan112 - Group 112
State is Standby
9 state changes, last state change 6w4d
Virtual IP address is 10.116.12.1
Hello time 250 msec, hold time 750 msec
Next hello sent in 0.182 secs
Redirect time 600 sec, forwarder time-out 14400 sec
Preemption disabled
Active is 10.116.12.2, priority 110 (expires in 0.518 sec)
Standby is local
Priority 100 (default)
Weighting 100 (default 100), thresholds: lower 1, upper 100
Load balancing: round-robin
Group members:
001c.f6a9.f800 (10.116.12.3) local
001c.f6aa.0000 (10.116.12.2) authenticated
There are 2 forwarders (1 active)
Forwarder 1
State is Listen
4 state changes, last state change 6w4d
MAC address is 0007.b400.7001 (learnt)
Owner ID is 001c.f6aa.0000
Time to live: 14399.768 sec (maximum 14400 sec)
Preemption enabled, min delay 30 sec
Active is 10.116.12.2 (primary), weighting 100 (expires in 0.518 sec)
Arp replies sent: 2
Forwarder 2
State is Active
3 state changes, last state change 13w1d
MAC address is 0007.b400.7002 (default)
Owner ID is 001c.f6a9.f800
Preemption enabled, min delay 30 sec
Active is local, weighting 100
Arp replies sent: 1
