[eng/rtg] changing loopbacks

Austin amckinle at andrew.cmu.edu
Fri Sep 30 23:55:06 UTC 2005


It's worth noting that C's don't need actual IP address space assigned to 
the router-id for OSPF. It's just an arbitrary value; it's probably better 
karma to set it to whatever you want (maybe something that doesn't look 
like an IP address).

RFC 2328:

        Router ID
            A 32-bit number assigned to each router running the OSPF
            protocol.  This number uniquely identifies the router within
            an Autonomous System.



CCO:
<http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_command_reference_chapter09186a008010a39c.html#wp1049279>

Usage Guidelines

You can configure an arbitrary value in the IP address format for each 
router. However, each router ID must be unique.

If this command is used on an OSPF router process which is already active 
(has neighbors), the new router-ID is used at the next reload or at a 
manual OSPF process restart. To manually restart the OSPF process, use the 
clear ip ospf command. 



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