Remote Site Dual Link using IP Route Sharing


Userlevel 2
we are planning to add another WAN Link connection to our remote site, can we use the ip route sharing over WAN Link? WAN link is L2 connection provided by telco. Link 1 - VLAN 100 Link 2 - VLAN 200 thanks

6 replies

Userlevel 4
yes this should be fine.
with two static routes with same cost.
Userlevel 2
Hi Parthiban, please see my network diagram and configuration below below. --------------------------------------------------------------------------------------------------- Data Center Core Switch: enable ipforwarding configure iproute add 172.30.1.0/24 172.20.1.246 configure iproute add 172.30.1.0/24 172.21.1.246 enable iproute sharing vr vr-default enable loopback-mode vlan vlanserver --------------------------------------------------------------------------------------------------- Branch Core Switch: enable ipforwarding configure iproute add 172.25.1.0/24 172.20.1.1 configure iproute add 172.25.1.0/24 172.21.1.1 enable iproute sharing vr vr-default enable loopback-mode vlan vlanlan ---------------------------------------------------------------------------------------------------- i can ping the 172.25.1.1 from 172.30.1.1 if VLAN100 is up. However i cannot ping the 172.25.1.1 from 172.30.1.1 once i disconnect the VLAN100 connection in branch core switch. also, we check the iproute sharing using "show ipconfig" to confirm if enable. thanks, Marlon

Userlevel 3
Hi,

you have link up on core switch and some packet/flows will go via link one and some via link two (it depends on sharing criteria).

The core site doesn't know that one of the link on branch is down.

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Jarek
Userlevel 4
You should use static route with BFD to solve this issue.
Userlevel 2
Hi Parthiban, i already used static route with BFD but still have the same problem, Core Switch enable iproute bfd 172.20.1.246 vr vr-default enable iproute bfd 172.21.1.246 vr vr-default Branch Switch enable iproute bfd 172.20.1.1 vr vr-default enable iproute bfd 172.21.1.1 vr vr-dedault based on the command " show bfd session" all status are up. Thanks Marlon

Userlevel 2
after executing the command below on both switches, the core now can see if one of the branch link is down and then utilized the other link. enable iproute bfd vr vr-default thanks! Great Help!

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