Remote Site Dual Link using IP Route Sharing

  • 0
  • 1
  • Question
  • Updated 4 years ago
  • Answered
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
Photo of Marlon

Marlon

  • 1,570 Points 1k badge 2x thumb

Posted 4 years ago

  • 0
  • 1
Photo of PARTHIBAN CHINNAYA

PARTHIBAN CHINNAYA, Alum

  • 4,382 Points 4k badge 2x thumb
yes this should be fine.
with two static routes with same cost.
Photo of Marlon

Marlon

  • 1,570 Points 1k badge 2x thumb
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

Photo of Jarek

Jarek

  • 2,398 Points 2k badge 2x thumb
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.


--
Jarek
(Edited)
Photo of PARTHIBAN CHINNAYA

PARTHIBAN CHINNAYA, Alum

  • 4,382 Points 4k badge 2x thumb
You should use static route with BFD to solve this issue.
Photo of Marlon

Marlon

  • 1,570 Points 1k badge 2x thumb
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
Photo of Marlon

Marlon

  • 1,570 Points 1k badge 2x thumb
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!