I have only learned GLBP on paper, this is the first time I configured it and tried out.
1841-1 shall be the active for vlan 10, 20 and 30.
1841-2 shall be the active for vlan 99, 100 and 101.
Vlan 99, 100 and 101 are user vlans, I have only configured the vlan 99.
1841-1 configuration for vlan 10
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 172.16.10.1 255.255.255.0
glbp 10 ip 172.16.10.3
glbp 10 timers msec 500 msec 1500
glbp 10 priority 150
glbp 10 preempt
glbp 10 client-cache maximum 25
end
1841-1 configuration for vlan 20
interface FastEthernet0/0.20
encapsulation dot1Q 20
ip address 172.16.20.1 255.255.255.0
glbp 20 ip 172.16.20.3
glbp 20 timers msec 500 msec 1500
glbp 20 priority 150
glbp 20 preempt
glbp 20 client-cache maximum 25
end
1841-1 configuration for vlan 30
interface FastEthernet0/0.30
encapsulation dot1Q 30
ip address 172.16.30.1 255.255.255.0
glbp 30 ip 172.16.30.3
glbp 30 timers msec 500 msec 1500
glbp 30 priority 150
glbp 30 preempt
glbp 30 client-cache maximum 25
end
1841-1 configuration for native vlan 200
interface FastEthernet0/0.200
encapsulation dot1Q 200 native
ip address 192.168.200.1 255.255.255.0
end
1841-1 configuration for user vlan 99
interface FastEthernet0/0.99
encapsulation dot1Q 99
ip address 10.99.99.1 255.255.255.0
glbp 99 ip 10.99.99.3
glbp 99 timers msec 500 msec 1500
glbp 99 preempt delay minimum 60
glbp 99 weighting 100 lower 55 upper 90
glbp 99 client-cache maximum 254
glbp 99 name user-99
glbp 99 weighting track 99 decrement 50
end
1841-2 configuration for vlan 10
interface FastEthernet0/0.10
encapsulation dot1Q 10
ip address 172.16.10.2 255.255.255.0
glbp 10 ip 172.16.10.3
glbp 10 timers msec 500 msec 1500
glbp 10 preempt
glbp 10 client-cache maximum 25
end
1841-2 configuration for vlan 20
interface FastEthernet0/0.20
encapsulation dot1Q 20
ip address 172.16.20.2 255.255.255.0
glbp 20 ip 172.16.20.3
glbp 20 timers msec 500 msec 1500
glbp 20 preempt
glbp 20 client-cache maximum 25
end
1841-2 configuration for vlan 30
interface FastEthernet0/0.30
encapsulation dot1Q 30
ip address 172.16.30.2 255.255.255.0
glbp 30 ip 172.16.30.3
glbp 30 timers msec 500 msec 1500
glbp 30 preempt
glbp 30 client-cache maximum 25
end
1841-2 configuration for vlan 99
interface FastEthernet0/0.99
encapsulation dot1Q 99
ip address 10.99.99.2 255.255.255.0
glbp 99 ip 10.99.99.3
glbp 99 timers msec 500 msec 1500
glbp 99 priority 150
glbp 99 preempt
glbp 99 weighting 150 lower 90 upper 140
glbp 99 client-cache maximum 254
glbp 99 name user-99
glbp 99 weighting track 99 decrement 60
end
1841-2 native vlan 200
interface FastEthernet0/0.200
encapsulation dot1Q 200 native
ip address 192.168.200.2 255.255.255.0
end
Verification
1841-2#sh glbp brief
Interface Grp Fwd Pri State Address Active router Standby router
Fa0/0.10 10 – 100 Standby 172.16.10.3 172.16.10.1 local
Fa0/0.10 10 1 – Listen 0007.b400.0a01 172.16.10.1 –
Fa0/0.10 10 2 – Active 0007.b400.0a02 local –
Fa0/0.20 20 – 100 Standby 172.16.20.3 172.16.20.1 local
Fa0/0.20 20 1 – Listen 0007.b400.1401 172.16.20.1 –
Fa0/0.20 20 2 – Active 0007.b400.1402 local –
Fa0/0.30 30 – 100 Standby 172.16.30.3 172.16.30.1 local
Fa0/0.30 30 1 – Listen 0007.b400.1e01 172.16.30.1 –
Fa0/0.30 30 2 – Active 0007.b400.1e02 local –
Fa0/0.99 99 – 150 Active 10.99.99.3 local 10.99.99.1
Fa0/0.99 99 1 – Listen 0007.b400.6301 10.99.99.1 –
Fa0/0.99 99 2 – Active 0007.b400.6302 local –
Fa0/0.100 100 – 150 Active 10.100.100.3 local 10.100.100.1
Fa0/0.100 100 1 – Listen 0007.b400.6401 10.100.100.1 –
Fa0/0.100 100 2 – Active 0007.b400.6402 local –
1841-1#sh glbp brief
Interface Grp Fwd Pri State Address Active router Standby router
Fa0/0.10 10 – 150 Active 172.16.10.3 local 172.16.10.2
Fa0/0.10 10 1 – Active 0007.b400.0a01 local –
Fa0/0.10 10 2 – Listen 0007.b400.0a02 172.16.10.2 –
Fa0/0.20 20 – 150 Active 172.16.20.3 local 172.16.20.2
Fa0/0.20 20 1 – Active 0007.b400.1401 local –
Fa0/0.20 20 2 – Listen 0007.b400.1402 172.16.20.2 –
Fa0/0.30 30 – 150 Active 172.16.30.3 local 172.16.30.2
Fa0/0.30 30 1 – Active 0007.b400.1e01 local –
Fa0/0.30 30 2 – Listen 0007.b400.1e02 172.16.30.2 –
Fa0/0.99 99 – 100 Standby 10.99.99.3 10.99.99.2 local
Fa0/0.99 99 1 – Active 0007.b400.6301 local –
Fa0/0.99 99 2 – Listen 0007.b400.6302 10.99.99.2 –
Fa0/0.100 100 – 100 Standby 10.100.100.3 10.100.100.2 local
Fa0/0.100 100 1 – Active 0007.b400.6401 local –
Fa0/0.100 100 2 – Listen 0007.b400.6402 10.100.100.2 –
It would be better to put a third router, so that one AVG there’s two AVF, one AVF down the other AVF will take over, if a AVG down the other AVF will take over.
