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VSP OSPF with fabric SPBM/ISIS

VSP OSPF with fabric SPBM/ISIS

Anonymous
Not applicable

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.

1 ACCEPTED SOLUTION

Miguel-Angel_RO
Valued Contributor II

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

View solution in original post

5 REPLIES 5

Miguel-Angel_RO
Valued Contributor II

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

GTM-P2G8KFN