300-410 Exam Dumps - Implementing Cisco Enterprise Advanced Routing and Services (300-410 ENARSI)

https://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/23675-27.html

https://community.cisco.com/t5/networking-documents/how-to-configure-pbr/ta-p/3122774

From the output of the “show ip eigrp topology …” command, we notice network 192.168.13.0/24 was learned via two routes:+ From 192.168.23.3 (R3) with FD = 1075200 and AD = 281600+ From 192.168.12.1 (R1) with FD = 2611200 and AD = 281600

From the output of the “show ip route …” command, we learned that the best (and chosen) path is via 192.168.23.3 (R3).

To use both paths (called unequal cost load balancing) with EIGRP, the second path via R1 must satisfy the feasibility condition. The feasibility condition states that, theAdvertised Distance (AD) of a route must be lower than the feasible distance of the current successor route.

In this case, the second path satisfies the feasible condition as its AD (281600) is smaller than the FD (1075200) of the best path. Therefore we can configure loadbalancing with “variance” command.

In other words, EIGRP will install all paths with metric < variance * best_metric into the local routing table, provided that it meets the feasibility condition to preventrouting loop. Therefore we can calculate the variance > metric / best_metric = 2611200 / 1075200 =2.4.

So with a variance greater than 2 (and must be an integer), we can load balance traffic to network 192.168.13.0/24.

--------------------------R1---------------------------------------------

interface Ethernet0/0

ip address 209.165.201.1 255.255.255.0

ip access-group EGRESS2 out

ipv6 address 2001:DB8::1/64

end

----------------------R2--------------------------------------------------

interface Ethernet0/0

ip address 209.165.201.25 255.255.255.0

ipv6 address 2001:DB8::2/64

ipv6 address autoconfig

ipv6 nd autoconfig default-route

ipv6 nd cache expire 60

ipv6 nd ra suppress

ipv6 traffic-filter INGRESS in

end

IOU_Router2#telnet 2001:DB8::1

Trying 2001:DB8::1 ... Open

IOU_Router1 >

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