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MICE-DISCUSS  August 2012

MICE-DISCUSS August 2012

Subject:

Re: Juniper Switch upgrade

From:

James Stahr <[log in to unmask]>

Reply-To:

MICE Discuss <[log in to unmask]>

Date:

Thu, 23 Aug 2012 13:33:13 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (45 lines)

On 8/22/2012 4:51 PM, Doug McIntyre wrote:
> On Wed, Aug 22, 2012 at 02:47:21PM -0500, Justin Krejci wrote:
>    
>> While I agree with the general sentiment that the IP change and switch
>> change will likely be smooth, the IP change can be done more
>> transparently and has literally nothing to do with the L2 gear.
>> To that end, I don't see any reason to not configure/assign the new IP
>> block now and let folks start using it right away, even before the
>> switch switch.
>>      
> But, we don't have a central router?
>
> If your border to the exchange right now got a prefix with the next
> hop of 206.108.255.3, how'd you get there? You'd have no route to host
> for 206.108.255.3.
>
> That is why I brought up the secondary IPs. Once everybody puts in a
> secondary IP in 206.108.255.0/24, they'll know how to try to get to
> 206.108.255.3 for my prefix announcement. But I can't really do the
> prefix announcement with the next-hop in 206.108.255.3 until everybody
> knows how to get to 206.108.255.0/24?
>
>    
We can remotely verify that everyone has configured a secondary IP, but 
that's just the start.  You've also got to duplicate ALL of your peer 
BGP sessions beforehand as well.  Why?  Well,
I don't believe Cisco can initiate a BGP session on a secondary address 
so once a $C router switches their primary and secondary, they cannot 
initiate a BGP session.  Not a problem yet.  What about when the next 
one does it?  Suddenly neither of the Cisco devices can peer with each 
other..  I've not been through an exchange re-address, but given this 
limitation, I foresee many problems and the idea of a "flag day" much 
more appealing - luckily though, most participants are using the route 
server.

Hmm... I assume the BIRD configuration allows you to specify source IP's 
to be used for each peer?

-James
CDW

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