Merit Network
Can't find what you're looking for? Search the Mail Archives.
  About Merit   Services   Network   Resources & Support   Network Research   News   Events   Home

Discussion Communities: Merit Network Email List Archives

North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: [NANOG] RFC1918 conformance

  • From: Alex P. Rudnev
  • Date: Wed Feb 12 06:40:33 1997

> >For example. I have a lot of CISCO routers with OSPF protocol. Thnis 
> >crazy IOS use highest loopback interface address as router-ID address; I 
> >use loopbacks to install load balancing etc. and I can't prevent 
> >loopbacks from being equal on the different routers. That's why I hardly 
> >need some IP addresses for 'Loopback 98' interface to use it as 
> >router-ID; and this have to be higher than any user's addresses. I use 
> >233.255.254.0/24 for this purposes, but it's not reserved address.
> >
> >This is one, simple, example why it's nessesary to reserve some short 
> >address space in the begin and in the end of total addresses.
> 
> No, that's an example of a poorly designed protocol
> implementation. One ought to be able to specify an arbitrary router id
> for OSPF (heh - even Bay routers can do that :) rather that relying on
> such an odd algorithm. I was so surprised by this that I just had to go
> look it up:
I know _it's example of poorly designet software_. But I'd like to note 
it's not only example when it's usefull to have some addresses _greater 
than any other_ for private usage.

> <http://www.cisco.com/univercd/data/doc/software/11_2/cnp1/5ciprout.htm#REF38888>
> 
> The equivalent Bay reference:
> 
> <http://support.baynetworks.com/Library/tpubs/content/114065A/J_55.HTM#HEADING55-6>
> 
Yes, I was more surprised when they (cisco) did not implement something 
like _ip ospf router-id A.B.C.D_ into new IOS 11.2. We have 3 or 4 
routing troubles due to this IOS property (and it always looked as 
_hidden bug_ because it is si,ular to the delayed bomb - it explodes 1 
week below some mistake was made in the config files -:)).

- - - - - - - - - - - - - - - - -




Discussion Communities


About Merit | Services | Network | Resources & Support | Network Research
News | Events | Contact | Site Map | Merit Network Home


Merit Network, Inc.