How many routing processes can a router run?

Unanswered Question
Oct 9th, 2007

Hi there,

Can anybody tell me how many routing process a Cisco router can run? According to one book I've read it is:

1 RIP

1 BGP

1 ISIS

30 IGRP

30 OSPF


It does not mention EIGRP however. I'm assuming that that would be 30 the same as IGRP? I know nobody would run 30 routing processes in the real world (unless they're on day release) but it's a question that has come up in a simulation exam.


Can anybody tell me if the figures above are correct? And am I right about the EIGRP being 30 too?


Thanks

Pete.

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rainer_rudigier Tue, 10/09/2007 - 03:34

hi Pete,


30 routing processes are max on a router (1 BGP + 29 OSPF for example) - tried it on my lab routers 2600 3600 .. 12.3 and 12.4


for 31 i got


Router-5(config-router)#router eigrp 130

too many IP routing processes


and you are right EIGRP is also >= 1 process per router


could be that this limitation is different on bigger router - anybody knows ?


you could try booting a 7200 image via dynamips to test it


_rainer

rainer_rudigier Tue, 10/09/2007 - 03:41

PS regarding EIGRP ...


from 12.4 release notes (look at the workaround) - so it seems to be a limitation inside IOS


CSCsi68882


Symptoms: A router running EIGRP can crash when removing an EIGRP process.


Conditions: The crash will only happen where there are more than thirty IP routing protocol processes created and the last one is EIGRP. Note that this does not include VRFs. When the 31st routing protocol process is attempted, an error message wi ll be issued stating "too many IP routing processes". If attempt is then made to remove an EIGRP routing process by doing the command "no router eigrp ", the router will crash.


Workaround: Don't define over 30 IP routing protocol processes.

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