Route Reflector Client Design Question

Fri May 4 21:02:16 UTC 2018

Ahad,

The Cores have
Connections to other POPs
Transiting
IX circuits connected on them
Also have some Customer on them so they do also act like a PE.

Thanks

Erik

Erik Sundberg
Sr. Network Engineering
Network Engineering Department
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From: Ahad Aboss [mailto:ahad at swiftelnetworks.com]
Sent: Friday, May 4, 2018 9:16 AM
To: Erik Sundberg <ESundberg at nitelusa.com>
Cc: NANOG <nanog at nanog.org>
Subject: Re: Route Reflector Client Design Question

Erik,

Before I email my suggestions, can you clarify the followings;

Do Core1 and Core2 also provide the function of BDRs peering with your upstream/s?

Or

Just acting as Core/RRs with 500Mbps of traffic traversing through them?

Cheers
Ahad

On Fri, May 4, 2018 at 4:01 PM, Erik Sundberg <ESundberg at nitelusa.com<mailto:ESundberg at nitelusa.com>> wrote:
I have a RR Client design question......

CORE1-------------------2x10G-----------------------CORE2
|                                                                                   |
|                                                                                   |
|                                10G Ring                                   |
|                                                                                   |
|                                                                                   |
PE1----------PE2----------PE3----------PE4----------PE5

-Core1 & Core2 are RR Reflectors with full IPV4 Tables (ASR9K)
-MPLS LDP Enabled
-IGP is ISIS
-Each PE peers only with Core1 and Core2 as RR Clients with iBGP
-PE's are only receiving a default route from the Core Routers due to TCAM size of 20K (ASR920's\ME3800's)
-The ring does not have that much traffic on it <500m, so I do not want to use additional 10G ports on the Core's and is why I have it in a 10G U ring.
-Primary link to the cores is via the PE1 --- CORE1 Like......... For this discussion the link between PE5 to CORE2 is set up as a backup link.

The scenario is I have traffic between PE2 and PE3. Since the PE's are only receiving a default route from the Cores. Traffic is label switch from PE2 - PE1 - Core1 does a IP lookup at Ingress then label switches back to PE1-PE2-PE3. This ends up being 5 hops and doubling the traffic on the link to the Cores.

My questions is how do I get traffic to go directly between the PE's without going to the Core Routers?

1. Can I enable iBGP between the PE's in a full mesh to allow traffic between the PE's without going to the core's. Or does this break the Route Reflector model?
2. Create a route policy on the Core's advertising routes learned from the PE's back to all the PE's on the ring.
3. Is this one of the down sides to U Rings?
4. Leave it alone and move on to bigger and better things....

Thanks

Erik

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