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EIGRP manipulation issue

osman.elhanafy
Level 1
Level 1

Dears,
We connect the branches with EIGRP over DMVPN with two hubs on the HQ.
We want to manipulate the video traffic to go and back through the same tunnel (same hub).
So please does anyone have any configuration example???

2 Replies 2

Hello,

 

a simple route map in combination with policy routing works. Assuming that you have two tunnels on each branch router, you specify the voice and video traffic, and send it out through the respective tunnel.

 

ip access-list extended VIDEO_ACL
permit ip any any dscp cs4
permit ip any any dscp af41
!
ip access-list extended VOICE_ACL
permit ip any any dscp cs3
permit ip any any dscp ef
!
route-map VIDEO_VOICE_RM permit 10
match ip address VIDEO_ACL
match ip address VOICE_ACL
set interface Tunnel1
!
interface GigabitEthernet0/0
description LAN
ip policy route-map VIDEO_VOICE_RM

Giuseppe Larosa
Hall of Fame
Hall of Fame

Hello @osman.elhanafy ,

EIGRP metric manipulation can be performed by using offset-lists on both the spokes and the hub that should not transmit and reiceve video traffic.

However, this is possible only if all the video endpoints both in the sites and in the central site have their own dedicated IP subnet.

Because EIGRP metric manipulation happens for prefix not for single end user hosts.

 

access-list 10 permit 192.168.10.0 0.0.0.255

 

router eigrp 100

offset-list 10 20   out tunnel 1

(to be checked the exact syntax of the command can be different)

offset-list {access-list-number | access-list-name} {in | out} offset [interface-type interface-number]

see

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/command/ire-cr-book/ire-i1.html?dtid=osscdc000283#wp4196374404

 

on the hub all the remote video IP subnets should be processed by the ACL used by offset-list. This is done on the tunnel that should not be used as the offset will increase the delay component that is cumulative in EIGRP composite metric.

 

If this is not true, and video endpoints are just hosts in normal data IP subnets you should use PBR policy based routing to identify video traffic both on hub router(s) and on the spoke site routers.

If you have two DMVPN tunnels and two hubs PBR is possible and easy to achieve.

 

 

Hope to help

Giuseppe