Tuesday 26 May 2015

GLBP Basic

Topology Makeup:

All the spokes (IOU2 - IOU5) will be part of GLBP group. IOU2 priority will be set as 200 so will be selected as Active Virtual Gateway(AVG) and IOU3 would be the standby AVG as its priority is 150, the second highest priority among IOU3-IOU5. At start of topology IOU3-IOU5 will be acting as Actve virtual Forwarders(AVF). AVG(IOU2) would be responsible for assigning vMAC and AVF numbers to the other members of GLBP group.

Topology:






GLBP Group Members: IOU2 - IOU5

Below are the configurations for each of the switches:

IOU1:

IOU1#conf t
IOU1(config)#no ip igmp snooping
IOU1(config)#int range eth 0/0 - 3
IOU1(config-if-range)#no shut
IOU1(config-if-range)#switchport trunk encapsulation dot1q
IOU1(config-if-range)#switchport mode trunk
IOU1(config-if-range)#exit
IOU1(config)#vlan 50
IOU1(config-vlan)#exit
IOU1(config)#int vlan 50
IOU1(config-if)#no shut
IOU1(config-if)#end
IOU1#wr

IOU2: 


IOU2#conf t
IOU2(config)#no ip igmp snooping
IOU2(config)#int eth 0/0
IOU2(config-if)#no shut
IOU2(config-if)#switchport trunk encapsulation dot1q
IOU2(config-if)#switchport mode trunk
IOU2(config-if)#exit
IOU2(config)#vlan 50
IOU2(config-vlan)#exit
IOU2(config)#int vlan 50
IOU2(config-if)#no shut
IOU2(config-if)#ip address 192.168.1.10 255.255.255.0
IOU2(config-if)#glbp 1 priority 200
IOU2(config-if)#glbp 1 preempt
IOU2(config-if)#glbp 1 ip 192.168.1.1
IOU2(config-if)#end
IOU2#wr


IOU3: 


IOU3#conf t
IOU3(config)#no ip igmp snooping
IOU3(config)#int eth 0/0
IOU3(config-if)#no shut
IOU3(config-if)#switchport trunk encapsulation dot1q
IOU3(config-if)#switchport mode trunk
IOU3(config-if)#exit
IOU3(config)#vlan 50
IOU3(config-vlan)#exit
IOU3(config)#int vlan 50
IOU3(config-if)#no shut
IOU3(config-if)#ip address 192.168.1.11 255.255.255.0
IOU3(config-if)#glbp 1 priority 150
IOU3(config-if)#glbp 1 preempt
IOU3(config-if)#glbp 1 ip 192.168.1.1
IOU3(config-if)#end
IOU3#wr

IOU4: 


IOU4#conf t
IOU4(config)#no ip igmp snooping
IOU4(config)#int eth 0/0
IOU4(config-if)#no shut
IOU4(config-if)#switchport trunk encapsulation dot1q
IOU4(config-if)#switchport mode trunk
IOU4(config-if)#exit
IOU4(config)#vlan 50
IOU4(config-vlan)#exit
IOU4(config)#int vlan 50
IOU4(config-if)#no shut
IOU4(config-if)#ip address 192.168.1.12 255.255.255.0
IOU4(config-if)#glbp 1 priority 100
IOU4(config-if)#glbp 1 ip 192.168.1.1
IOU4(config-if)#end
IOU4#wr
IOU5: 


IOU5#conf t
IOU5(config)#no ip igmp snooping
IOU5(config)#int eth 0/0
IOU5(config-if)#no shut
IOU5(config-if)#switchport trunk encapsulation dot1q
IOU5(config-if)#switchport mode trunk
IOU5(config-if)#exit
IOU5(config)#vlan 50
IOU5(config-vlan)#exit
IOU5(config)#int vlan 50
IOU5(config-if)#no shut
IOU5(config-if)#ip address 192.168.1.13 255.255.255.0
IOU5(config-if)#glbp 1 priority 100
IOU5(config-if)#glbp 1 ip 192.168.1.1
IOU5(config-if)#end
IOU5#wr

RESULTS: 
IOU2:
 IOU3: 
 IOU4:
 IOU5:


This configuration has been done without any Weighting, Tracking , authentication etc. 
Will add details later sometime as i am preparing for my CCNP- SW exam and this above basic lab is part of the High Availability Topic. Do let me know if i am wrong somewhere as i am also learning.