[c-nsp] IS-IS Multiarea on 12.2 SR

[Oliver Boehmer (oboehmer)]

Jared,

> I've been having quite a few adventures with IS-IS over the last few
weeks
> and have finally hit a wall, so I'm hoping someone here can give me a
hand.
> Basically, I need to build a network with IS-IS multiarea as described
here:
>
http://www.cisco.com/en/US/products/ps6599/products_data_sheet09186a0080
0e97
> 80.html

I reckon you need to build this for IP? ISIS multiarea is only supported
for CLNS routing, as stated in the above link under "Restrictions".

> Secondarily, if we can't have true IS-IS multiarea, we may be able to
> simulate it by manually redistributing from the L1 instances to the L2
> instances, and setting default-information originate on the L1
instances. I
> attempted this in the lab, and while the commands are accepted and
appear to
> be good, neither redist nor default origination is actually happening.
> Does anyone have any suggestions on this front? Redist and default
> origination should "just work".

not sure what you mean here as an alternative. You can use
"default-information originate" to originate a 0.0.0.0/0 in the node's
LSPs (instead of using the attached-bit from the L1L2 node, possibly
along with "never-set-attached-bit" and "ingore-attached-bit" knobs to
control ATT bit  behaviour), but the L1 -> L2 advertisement requires a
"proper" ISIS design (i.e. no multi-area config when using it for IP).

	oli