Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

GLBP & Hostflapping errors

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

1 REPLY
Silver

Re: GLBP & Hostflapping errors

If the MAC address specified in the error message can be traced, this is likely the issue.

Or

The host is connected to port Gi2/3 and port Gi1/3 runs a type of clustering or redundancy and has an issue

713
Views
0
Helpful
1
Replies
CreatePlease login to create content