12-01-2020 12:17 PM
Hi,
Apologies if this is a simple question.
Have a S8 network that is being migrated to VSP’s. The legacy network predominantly uses OSPF.
The question I have is with the new network built on SPBM / IS-IS fabric using GRT (IP Shortcuts). That means I will be running both IS-IS and OSPF.
As networks that are transitioned to the VSP on the GRT will use IS-IS of which redistribution of directly connected networks will be applied to the router isis.
OSPF will also be enabled, but predominantly for external routing devices to interact with the new.
That means I essentially need to redistribute directly connected networks in IS-IS into OSPF, and OSPF learned routes into IS-IS, but obviously stop a routing loop between the two i.e. possibly need to create a route map to achieve this?
Now that might be the right or wrong way of doing it, even could possibly have my understanding wrong.
Either way I’m looking for some guidance on the best practice and what the config might look like to achieve this.
Many thanks in advance.
Solved! Go to Solution.
12-01-2020 12:34 PM
Martin,
A route-map is not really necessary, you’ll have to play with the route redistribution rules.
Depending on where is located your default route, you could redistribute OSPF in ISIS and ISIS in OSPF or not. Those rules are of course VRF dependent
Here an example of redistribute rules I use between OSPF and ISIS:
#
# IP REDISTRIBUTION CONFIGURATION - GlobalRouter
#
router ospf
redistribute isis
redistribute static
redistribute static enable
exit
router isis
redistribute static
redistribute static metric 1
redistribute static enable
redistribute direct
redistribute direct route-map "deny-vist-address"
redistribute direct enable
exit
ip ospf apply redistribute static
isis apply redistribute static
isis apply redistribute direct
Mig
12-01-2020 12:34 PM
Martin,
A route-map is not really necessary, you’ll have to play with the route redistribution rules.
Depending on where is located your default route, you could redistribute OSPF in ISIS and ISIS in OSPF or not. Those rules are of course VRF dependent
Here an example of redistribute rules I use between OSPF and ISIS:
#
# IP REDISTRIBUTION CONFIGURATION - GlobalRouter
#
router ospf
redistribute isis
redistribute static
redistribute static enable
exit
router isis
redistribute static
redistribute static metric 1
redistribute static enable
redistribute direct
redistribute direct route-map "deny-vist-address"
redistribute direct enable
exit
ip ospf apply redistribute static
isis apply redistribute static
isis apply redistribute direct
Mig