Monday, October 22, 2012

Lab 201 - EIGRPv6 Unequal Load Balance

Prerequisites: CCNP level skills.

Topology

Notice!
IPv6 addresses have changed. Follow the below topology diagram and tasks to accomplish the goals.

Pic1. IPv6 Topology Diagram.

Task 1
Configure IPv6 addresses between R2 and R3 on their Serial1/0 links. Enable EIGRPv6 AS 1 on these interfaces. Follow the IPv6 addressing scheme used in previous labs.

Task 2
Configure Frame-Relay Connection between R2 and R3 so that EIGRPv6 thinks it is a half the speed of Serial1/0. 

Task 3
Enable unequal cost load balancing between R2 and R3.

Solution

Task 1
Configure IPv6 addresses between R2 and R3 on their Serial1/0 links. Enable EIGRPv6 AS 1 on these interfaces. Follow the IPv6 addressing scheme used in previous labs.

R2 Config:
!
interface Serial1/0
 ipv6 address FC00:1:1:20::2/64
 ipv6 eigrp 1
 serial restart-delay 0
!

R3 Config:
!
interface Serial1/0
 ipv6 address FC00:1:1:20::3/64
 ipv6 eigrp 1
 serial restart-delay 0
!

Task 2
Configure Frame-Relay Connection between R2 and R3 so that EIGRPv6 thinks it is a half the speed of Serial1/0. 

Pic. 2 - Interface Speed Before the Adjustment (both).

R2 Config:
!
interface Serial0/0
 bandwidth 772
!

R3 Config:
!
interface Serial0/0.123
 bandwidth 772
!

Task 3
Enable unequal cost load balancing between R2 and R3.

Check if the second link (Serial0/0.123) is a Feasible Successor.

Pic. 3 - Picking FC00:A:A:A::2/128 for Feasible Successor.

Frame-Relay connection is the Feasible Successor (AD < FD) which is pre-requisite for un-equal load balancing. 

Currently, R3 has only one next-hop address towards FC00:A:A:A::2/128.

Pic. 4 - R3's Path for FC00:A:A:A::2/128.

R2 Config:
!
ipv6 router eigrp 1
 variance 2
 no shutdown
!

R3 Config:
!
ipv6 router eigrp 1
 variance 2
 no shutdown
!

After modifying 'variance':

Pic. 5 - R3's Path for FC00:A:A:A::2/128.