4 virtual mac addresses in glbp

Answered Question
Jan 25th, 2009
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Hi Every body!


AVG in glbp assigns virtual mac addresses. My book shows these mac addresses

0007.b400.0101

0007.b400.0102

0007.b400.0103

0007.b400.0104

Are these addresses same across all platforms or ios/cat os?


Thanks a lot!

Correct Answer by johnlloyd_13 about 8 years 2 months ago

yes, based on one of our config showed (IOS). 0007.b400.0101 and 0007.b400.0102 were used as virtual mac addresses. 0007.b400.0101 was the virtual mac address of our primary router and 0007.b400.0102 was on the secondary.


Vlan1 - Group 1

State is Active

2 state changes, last state change 1y0w

Virtual IP address is 10.80.102.1

Hello time 3 sec, hold time 10 sec

Next hello sent in 0.440 secs

Redirect time 600 sec, forwarder time-out 14400 sec

Preemption enabled, min delay 0 sec

Active is local

Standby is 10.80.102.3, priority 254 (expires in 8.708 sec)

Priority 255 (configured)

Weighting 110 (configured 110), thresholds: lower 95, upper 105

Track object 20 state Up decrement 20

Load balancing: weighted

There are 2 forwarders (1 active)

Forwarder 1

State is Active

795 state changes, last state change 2w2d

MAC address is 0007.b400.0101 (default)

Owner ID is 0015.2ce0.d800

Redirection enabled

Preemption enabled, min delay 30 sec

Active is local, weighting 110

Arp replies sent: 8858

Forwarder 2

State is Listen

6 state changes, last state change 9w0d

MAC address is 0007.b400.0102 (learnt)

Owner ID is 0015.2ce0.dc00

Redirection enabled, 598.704 sec remaining (maximum 600 sec)

Time to live: 14398.704 sec (maximum 14400 sec)

Preemption enabled, min delay 30 sec

Active is 10.80.102.3 (primary), weighting 110 (expires in 8.704 sec)

Arp replies sent: 3085

Correct Answer by Yudong Wu about 8 years 2 months ago

GLBP is Cisco proprietary protocol. I believe that the same Mac address is used.

You can find more detail info here.

http://www.cisco.com/en/US/customer/docs/ios/12_2s/feature/guide/fs_glbp2.html

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Correct Answer
johnlloyd_13 Mon, 01/26/2009 - 02:26
User Badges:
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yes, based on one of our config showed (IOS). 0007.b400.0101 and 0007.b400.0102 were used as virtual mac addresses. 0007.b400.0101 was the virtual mac address of our primary router and 0007.b400.0102 was on the secondary.


Vlan1 - Group 1

State is Active

2 state changes, last state change 1y0w

Virtual IP address is 10.80.102.1

Hello time 3 sec, hold time 10 sec

Next hello sent in 0.440 secs

Redirect time 600 sec, forwarder time-out 14400 sec

Preemption enabled, min delay 0 sec

Active is local

Standby is 10.80.102.3, priority 254 (expires in 8.708 sec)

Priority 255 (configured)

Weighting 110 (configured 110), thresholds: lower 95, upper 105

Track object 20 state Up decrement 20

Load balancing: weighted

There are 2 forwarders (1 active)

Forwarder 1

State is Active

795 state changes, last state change 2w2d

MAC address is 0007.b400.0101 (default)

Owner ID is 0015.2ce0.d800

Redirection enabled

Preemption enabled, min delay 30 sec

Active is local, weighting 110

Arp replies sent: 8858

Forwarder 2

State is Listen

6 state changes, last state change 9w0d

MAC address is 0007.b400.0102 (learnt)

Owner ID is 0015.2ce0.dc00

Redirection enabled, 598.704 sec remaining (maximum 600 sec)

Time to live: 14398.704 sec (maximum 14400 sec)

Preemption enabled, min delay 30 sec

Active is 10.80.102.3 (primary), weighting 110 (expires in 8.704 sec)

Arp replies sent: 3085

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