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GLBP config

Ahmede
Level 1
Level 1

We have once L2 switch dually homed to two 2800 routers, we are running HSRP on both routers. To load balance traffic between the two routers we tried to move to GLBP, but once we remove HSRP and configure GLBP we see no traffic at all passing to the routers. Here's the GLBP config we added

Router 1 (Active router)

--------------------------

track 10 interface serial 0/0/0 line-protocol

track 20 interface serial 0/1/1 line-protocol

int g0/0

glbp 2 ip 10.1.70.6

glbp 2 load-balancing weighted

glbp 2 preempt

glbp 2 weighting 110 lower 95 upper 105

glbp 2 weighting track 10

glbp 2 weighting track 20

glbp 2 priority 105

Router 2

----------

track 10 interface serial 0/0 line-protocol

track 20 interface serial 0/1 line-protocol

int e0/0

glbp 2 ip 10.1.70.6

glbp 2 load-balancing weighted

glbp 2 weighting 110 lower 95 upper 105

glbp 2 weighting track 10

glbp 2 weighting track 20

4 Replies 4

Ahmede
Level 1
Level 1

Some show commands..

Router1

--------

Router1#sh glbp brie

Interface Grp Fwd Pri State Address Active router Standby route

Gi0/0 2 - 105 Active 10.1.70.6 local 10.1.70.5

Gi0/0 2 1 7 Active 0007.b400.0201 local -

Gi0/0 2 2 7 Listen 0007.b400.0202 10.1.70.5 -

Router1#sh glbp

GigabitEthernet0/0 - Group 2

State is Active

2 state changes, last state change 00:17:21

Virtual IP address is 10.1.70.6

Hello time 3 sec, hold time 10 sec

Next hello sent in 2.564 secs

Redirect time 600 sec, forwarder time-out 14400 sec

Preemption enabled, min delay 0 sec

Active is local

Standby is 10.1.70.5, priority 100 (expires in 8.500 sec)

Priority 105 (configured)

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

Track object 10 state Up decrement 10

Track object 20 state Up decrement 10

Load balancing: weighted

Group members:

0005.5e8e.f160 (10.1.70.5)

0016.4610.6bd8 (10.1.70.4) local

There are 2 forwarders (1 active)

Forwarder 1

State is Active

1 state change, last state change 00:17:11

MAC address is 0007.b400.0201 (default)

Owner ID is 0016.4610.6bd8

Redirection enabled

Preemption enabled, min delay 30 sec

Active is local, weighting 110

Forwarder 2

State is Listen

MAC address is 0007.b400.0202 (learnt)

Owner ID is 0005.5e8e.f160

Redirection enabled, 598.500 sec remaining (maximum 600 sec)

Time to live: 14398.500 sec (maximum 14400 sec)

Preemption enabled, min delay 30 sec

Active is 10.1.70.5 (primary), weighting 110 (expires in 8.500 sec)

Router1#sh glbp active

GigabitEthernet0/0 - Group 2

State is Active

2 state changes, last state change 00:17:30

Virtual IP address is 10.1.70.6

Hello time 3 sec, hold time 10 sec

Next hello sent in 2.672 secs

Redirect time 600 sec, forwarder time-out 14400 sec

Preemption enabled, min delay 0 sec

Active is local

Standby is 10.1.70.5, priority 100 (expires in 8.612 sec)

Priority 105 (configured)

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

Track object 10 state Up decrement 10

Track object 20 state Up decrement 10

Load balancing: weighted

Group members:

0005.5e8e.f160 (10.1.70.5)

0016.4610.6bd8 (10.1.70.4) local

There are 2 forwarders (1 active)

Forwarder 1

State is Active

1 state change, last state change 00:17:20

MAC address is 0007.b400.0201 (default)

Owner ID is 0016.4610.6bd8

Redirection enabled

Preemption enabled, min delay 30 sec

Active is local, weighting 110

Forwarder 2

State is Listen

MAC address is 0007.b400.0202 (learnt)

Owner ID is 0005.5e8e.f160

Redirection enabled, 598.612 sec remaining (maximum 600 sec)

Time to live: 14398.612 sec (maximum 14400 sec)

Preemption enabled, min delay 30 sec

Active is 10.1.70.5 (primary), weighting 110 (expires in 8.612 sec)

More show commands

Router 2

----------

Router2#sh glbp brie

Interface Grp Fwd Pri State Address Active router Standby router

Et0/0 2 - 100 Standby 10.1.70.6 10.1.70.4 local

Et0/0 2 1 - Listen 0007.b400.0201 10.1.70.4 -

Et0/0 2 2 - Active 0007.b400.0202 local -

Router2#sh glbp

Ethernet0/0 - Group 2

State is Standby

1 state change, last state change 00:15:37

Virtual IP address is 10.1.70.6

Hello time 3 sec, hold time 10 sec

Next hello sent in 2.135 secs

Redirect time 600 sec, forwarder time-out 14400 sec

Preemption disabled

Active is 10.1.70.4, priority 105 (expires in 7.159 sec)

Standby is local

Priority 100 (default)

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

Track object 10 state Up decrement 10

Track object 20 state Up decrement 10

Load balancing: weighted

There are 2 forwarders (1 active)

Forwarder 1

State is Listen

MAC address is 0007.b400.0201 (learnt)

Owner ID is 0016.4610.6bd8

Time to live: 14397.151 sec (maximum 14400 sec)

Preemption enabled, min delay 30 sec

Active is 10.1.70.4 (primary), weighting 110 (expires in 7.147 sec)

Forwarder 2

State is Active

1 state change, last state change 00:15:44

MAC address is 0007.b400.0202 (default)

Owner ID is 0005.5e8e.f160

Preemption enabled, min delay 30 sec

Active is local, weighting 110

Router2#sh glbp active

Router2#

Joseph W. Doherty
Hall of Fame
Hall of Fame

GLBP uses a different virtual MAC then HSRP. Likely clients where still trying to get to the gateway IP address using the prior HSRP MAC. You'll need to flush the client ARP caches after making the switch.

did u ever get this problem sorted??

if yes what was the issue???

can u pls post it so that it can help us

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