03-11-2004 11:03 AM - edited 03-02-2019 02:13 PM
Hi
I am preparing for CCNP, I ahve a question about AS is ospf. What determines if a particular router belongs to an AS, is its the OSPF process ID? I am not clear about this
thanks
03-11-2004 12:09 PM
Please check the following URL:
http://www.cisco.com/en/US/tech/tk365/tk480/technologies_design_guide09186a0080094e9e.shtml
The process ID has not the same significance for OSPF like it has for EIGRP. OSPF has no concept of AS. Instead, with OSPF, the area-id to which an interface belongs decides whether to exchange routing info or not. In fact there are a few more parameters that need to match (hello & dead time, etc) but these are generally equal in the whole network, so the area-id is the one that makes the final match.
Regards,
Leo
03-12-2004 02:22 PM
Hi
Thank you for sending you comments
One thing i am not clear with is, say I have to connect my AS with another AS and both run ospf. how is this handled.
03-12-2004 01:04 PM
The process number has no bearing on the AS a router is in for OSPF--it's not included in any OSPF prackets at all. An OSPF area boundary would be where two different processes talk on two different interfaces--the processes must exchange routes through redistribution. For instance, you could do this:
A--10.1.1.0/24--B--10.1.2.0/24--C
! router a
router ospf 100
network 10.1.1.0 0.0.0.25 area 0
! router b
router ospf 200
network 10.1.1.0 0.0.0.255 area 0
!
router ospf 100
network 10.1.2.0 0.0.0.255 area 0
! router c
router ospf 200
network 10.1.2.0 0.0.0.255 area 0
Router A's process 100 and router B's process 200 are in the same autonomous system, while router B's process 1 and router C's process 100 are in the same autonomous system.
I hope that helps....
:-)
Russ.W
03-12-2004 01:06 PM
dup..
03-12-2004 01:07 PM
dup..
03-13-2004 09:17 AM
Hi
Thank you for the reply
Also ignore my second question, that was so dumb to mix up exterior routing protocols with interior routing protocols
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide