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13. CONFIGURE LAYER 3 REDUNDANCY WITH GLBP

HOW TO CONFIGURE LAYER 3 REDUNDANCY WITH GLBP
 
Interface IP Address Configuration : 
  
R1 
 
Interface  IP Address   Subnet Mask 
S 0          3.3.3.2           255.0.0.0 
S 1          2.2.2.2           255.0.0.0 
E 0          20.1.1.1         255.0.0.0 
 
R2 
 
Interface  IP Address   Subnet Mask 
S 0/2        3.3.3.1         255.0.0.0 
FA 0/0     10.1.1.1        255.0.0.0 
 
R3 
 
Interface  IP Address   Subnet Mask 
S 1           2.2.2.1           255.0.0.0 
E 0/0     10.1.1.2          255.0.0.0 
 
SW1 
 
Ports   VLAN Assigned   Connected To 
FA 0/1  VLAN 1   R3 (10.1.1.2) 
FA 0/3  VLAN 1   R2 (10.1.1.1) 
FA 0/5  VLAN 1   PC 1 (10.1.1.3) 
FA 0/7  VLAN 1   PC 2 (10.1.1.4) 
 
Task 1 
 
Configure routing protocol (RIP) on R1, R2, and R3. 
Configure ports fa0/3, fa0/1, fa0/5 and fa0/7 as access ports on SW1 
Configure GLBP. 
 
 
R2 
 
Int fa 0/0 
Glbp 1 ip 10.1.1.10 
Glbp 1 priority 200 
Glbp 1 timers msec 250 msec 750 
Glbp 1 preempt
 
R3 
 
Int e 0/0 
Glbp 1 ip 10.1.1.10 
Glbp 1 priority 100 
Glbp 1 timers msec 250 msec 750
 
Verification: 
 
R2#show glbp brief 
 
When the PC’s send traffic to 20.0.0.0 network, the traffic is send via the active router 
which is R2. If R2 is busy in sending the traffic then R3 takes the active state and R2 is in 
the listening state. Thus load balancing is achieved.  
 
R2#show glbp
 
How to verify: 
 
Traceroute from PC1 to 20.0.0.0 network, the packet is send via R2.  
Traceroute from PC2 to 20.0.0.0 network, the packet is send via R2. 
If R2 is busy then the packet is send via R3, which is verified from the above output 
(traceroute 20.1.1.1 from PC2) 
 
From PC1: tracert 20.1.1.1
 
The first packet reaches 20.1.1.1 via 10.1.1.1 
 
From PC2: tracert 20.1.1.1
 
The first packet reaches 20.1.1.1 via 10.1.1.2 
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