This touches on something of relative interest.
With the following routing protocols one can run multiple instances on the
same router for whatever reason:
OSPF
IGRP
EIGRP
IS-IS ( well, I haven't actually tried it yet, but in theory it should
work )
eg router isis [tag1]
eg router isis [tag2]
With the rest, one can run only a single instance of the protocol:
RIP
RIP v2
BGP
With IGRP and EIGRP, only those routers with the identical process number
AS number if you will ) exchange information
With BGP there are mechanisms for allowing routers of differing AS numbers
to exchange information
As I said, of relative interest.
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Eric
Fairfield
Sent: Tuesday, January 16, 2001 11:31 AM
To: [EMAIL PROTECTED]
Subject: Re: OSPF Process ID
Autonomous Systems are not part of the OSPF protocol. It only functions as
a process id local to the router. This way you can actually run two
different OSPF autonomous systems separate from each other.
--
Eric Fairfield
CCIE #6413
<[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]..
.
>
> Does the OSPF process id have anything to do with its autonomous system
> number? In the sample configuration I found from the Cisco web site
>
(http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/np1_
> c/1cprt1/1cospf.htm#xtocid709131), it uses the autonomous system number in
> the 'router ospf' command. I am a little confused.
>
> -----Original Message-----
> From: Curtis Call [mailto:[EMAIL PROTECTED]]
> Sent: Monday, January 15, 2001 9:58 PM
> To: Ya Wen
> Cc: [EMAIL PROTECTED]
> Subject: Re: OSPF Process ID
>
>
> That won't be a problem at all since the "process ID" means different
> things for EIGRP and for OSPF. For EIGRP it servers as a routing domain,
> for instance a router with an EIGRP with a process number of #100 will
only
> communicate with other routers with the same process id. With OSPF
however
> the process ID refers to the routing process on the router and it has no
> significance beyond that particular router so you could have one router
> with OSPF process ID 1 and one with OSPF process ID 2 that would
> communicate just fine. Having EIGRP and OSPF have the same process ID
> won't cause any problems at all.
> Your updating problem must be stemming from some other issue, you could
> always post your configs if you wanted some help.
>
> At 03:19 PM 1/15/01 -0800, you wrote:
> >Hi, group:
> >
> >Will this a potential problem if I have both EIGRP and OSPF running in
the
> >same router with the same process ID, for example, ID #100. The reason I
> >am asking is because I have the exact situation on one of my router, it
> >seems like the router could not participate in the OSPF updating domain.
> >The only difference I can see from other OSPF routers is this router is
> >also running EIGRP with the same process ID. I am not doing any
> >redistribution here between EIGRP and OSPF.
> >
> >Thanks!
> >
> >-Ya
> >
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