Routing
Routing

RR question

08.05.11   |  
‎08-05-2011 02:23 PM

Hi All- I need some clarification- If i have 3 RRs fully mesed and clients only peer with 2 of the 3 RRs, is there any issue with that or do the clients need to peer with all RRs. also all RR use the same cluster ID.

 

Thanks

 

10 REPLIES
Routing

Re: RR question

08.05.11   |  
‎08-05-2011 04:17 PM

Sounds like you're over-building.  What's the use case for the 3rd BGP RR?  Typically we 2 routers serving as a BGP RR with the same cluster-id.  Remember to use a vanilla IBGP connection between the two RRs.

 

All clients need to have a connection to each BGP RR for full redundancy.

Doug Hanks
JNCIE-ENT #213, JNCIE-SP #875

Follow me on Twitter @douglashanksjr
Routing

Re: RR question

08.05.11   |  
‎08-05-2011 04:34 PM
IOS2JunOS,

I have seen just this exact design configuration at a major university and there should be no problems with this design. The dual peering gives you the required redundancy, it is not a requirement however that Route Reflector clients form peer with all Route Reflectors.

For what its worth, for scaling of very large networks it is not uncommon to have several pairs of route reflectors, and route reflector clients will only pair with their respective clusters... Also I have seen implementations that actually separate RR clusters whereby one cluster is used for IPv4 routes, whereas another cluster is used for VPN-NLRI... Lots of options here.

You are well within spec...
Stefan Fouant
Juniper Ambassador
JNCIE-SP, JNCIE-ENT, JNCIE-SEC, JNCI, CISSP, PCNSE, VCP-DV

Check out my blog at ShortestPathFirst

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Routing

Re: RR question

08.08.11   |  
‎08-08-2011 09:57 AM

cool..thank you both for the usefull info..

Routing

Re: RR question

08.08.11   |  
‎08-08-2011 10:11 AM

what's a good box to use for RR? is MX 5 good enough?

Routing

Re: RR question

08.08.11   |  
‎08-08-2011 11:35 AM

That's not an easy question to answer.  What type of routes will it be carrying?  Just IPv4? VPNv4-NLRI? IPv6? How many routing instances, and expected number of routes in each?  BGP Full Routes, etc.?

 

The MX in and of itself is an awesome platform, but you are going to want to take a look at the datasheets for each platform and determine if they meet your requirements based on the routing and forwarding table memory size, etc.

 

HTHs.

Stefan Fouant
Juniper Ambassador
JNCIE-SP, JNCIE-ENT, JNCIE-SEC, JNCI, CISSP, PCNSE, VCP-DV

Check out my blog at ShortestPathFirst

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If this post was helpful, please mark this post as an "Accepted Solution".
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Routing

Re: RR question

[ Edited ]
08.08.11   |  
‎08-08-2011 02:13 PM

IPV4 and IPV6 routes only. no VPNs, single routing instance...

RR will have about 10 clients to start- could increase to 15-20 later..each client has about 1mil bgp route with around 370k active bgp routes..

Routing

Re: RR question

08.09.11   |  
‎08-09-2011 02:06 AM

You may go ahead with MX240 with RE-2000. (It has been used for dedicated RR no forwarding through RR).

 

I am using same for one of the ISP design.

 

Hope this helps.

Saurabh Joshi
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CCNA,CCIP/JNCIA-EX,ER/JNCIS-ER,SEC,M/JNCIP-M
Routing

Re: RR question

08.10.11   |  
‎08-10-2011 09:39 AM

cool..i was thinking along the same line..thanks

Routing

Re: RR question

05.24.12   |  
‎05-24-2012 12:54 AM

hi,Stefan

my question is:

If I configure 2 RR server as client for each other,what will happen?

 

r3 RR client of r1 and r2

r4 RR client of r1 and r2

 r1 and r2 are RR server of r3 and r4

if I set r1 as client of r2,r2 as client of r2 ,what will happen?

 

 

JNCIE-SP/JNCIP-SEC/CCNP
Routing

Re: RR question

06.01.12   |  
‎06-01-2012 08:42 AM

240 sounds like overkill....

 

We tested an MX80 to 6000 BGP peers.....