OSPF vs IS-IS vs PrivateAS eBGP

Cord MacLeod cordmacleod at gmail.com
Sat Sep 12 01:49:59 UTC 2009

On Sep 11, 2009, at 6:23 PM, Randy Bush wrote:

>> I seem to get the impression that isis is preferred in the core. Any
>> reasons why folks dont prefer to go with ospf?
> a bit harder to attack clnp (is-is) than ip (ospf)
> is-is a bit simpler to configure, though you can get a sick as you
> want.  but don't.
> a bit simpler to code, so worked and was stable when ospf was far
> flakier than it is now.

I'd also add that ISIS supports IPv6 through the addition of TLVs  
whereas OSPF was redesigned into OSPFv3.

Personally I like ISIS due to it's simplicity and use it for router  
loopback advertisement only.

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