isis configuration

what's the difference in use between these two command sets? if I have a level 1-2 router?

config t
router isis
is-type level-1-2

and

config t
int s0/0
isis curcuit-type level-2
int f0/0
isis curcuit-type level-1

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Comments

dtlokee

The command in router configuration mode sets the level for the router, the interface command sets the level for the interface (overriding the global config command)

aueddonline

what's the advantage of configuring it on the interface?

dtlokee

If you have a level 1-2 router that connects over a link to a router that is Level 1 only, why send all the level 2 routes out the interface. Changing the level of the interface will conserve resources on the interface buy not advertising the L2 routes.

aueddonline

I get ya, so if all your router aren't level 1-2 and the 1-2 is actually connected to level 1 and level 2 routers it's best to use the interface to configure the level. cool

Paul Boz

aueddonline wrote:

what's the advantage of configuring it on the interface?

Fine tuning, in addition to what dtlokee said. The more specific you can get in your configuration the better your network will perform. Probably my favorite ipv6 feature is that OSPF for ipv6 lets you configure ospf on the interface like ISIS.

techster79

Paul Boz wrote:

aueddonline wrote:

what's the advantage of configuring it on the interface?

Fine tuning, in addition to what dtlokee said. The more specific you can get in your configuration the better your network will perform. Probably my favorite ipv6 feature is that OSPF for ipv6 lets you configure ospf on the interface like ISIS.

Can't that already be done with the mask portion of the command. To set OSPF to run in certain areas per interface, or not to run? Forgive me if I'm ignorant I am just done with EIGRP and moving into OSPF in my BSCI studies.

Paul Boz

techster79 wrote:

Can't that already be done with the mask portion of the command. To set OSPF to run in certain areas per interface, or not to run? Forgive me if I'm ignorant I am just done with EIGRP and moving into OSPF in my BSCI studies.

Click here, OSPF v3 setup

From the univerCD if you were curious.

As you can see, OSPF v3 is configured on the interface level, not global configuration. I just like it more that way

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