[alcatel-nsp] 7750 Route Reflector Server Question

[Ben Robinson]

In this case, the route reflector also has some external peers. So the intent is to set next hop self for just routes learned from those external peers.

Ben Robinson
Systems Engineer
LS Networks


-----Original message-----
From: Bryan <deadheadblues at gmail.com>
To: Ben Robinson <brobinson at lsnetworks.net>
Cc: Stefano Gridelli <sgridelli at gmail.com>, "alcatel-nsp at puck.nether.net" <alcatel-nsp at puck.nether.net>
Sent: Fri, Mar 4, 2011 02:05:53 GMT+00:00
Subject: Re: [alcatel-nsp] 7750 Route Reflector Server Question

I don't think a route reflector is supposed to change next hop. Are
you seeing otherwise?

On Thu, Mar 3, 2011 at 5:49 PM, Ben Robinson <brobinson at lsnetworks.net> wrote:
> Thanks for the reply. That's not quite what I'm after.
>
> In this case, I want to accomplish both on the same internal sessions to
> reflector clients. I want to set next hop self on routes learned from
> external peers and propagate to internal reflector clients. In the same
> internal sessions, I want leave the original IGP next-hop on internal routes
> reflected to the reflector clients.
>
> Ben Robinson
> Systems Engineer
> LS Networks
>
> -----Original message-----
>
> From: Stefano Gridelli <sgridelli at gmail.com>
> To: Ben Robinson <brobinson at lsnetworks.net>
> Cc: "alcatel-nsp at puck.nether.net" <alcatel-nsp at puck.nether.net>
> Sent: Fri, Mar 4, 2011 01:38:04 GMT+00:00
> Subject: Re: [alcatel-nsp] 7750 Route Reflector Server Question
>
> You can implement this without a policy but by simply creating two bgp
> groups:
> group internal
>    type internal
>    neighbor 10.0.0.1
>    exit
> exit
> group external
>    peer-as 1234;
>    neighbor 4.4.4.1;
>    exit
>     next-hop-self;
> exit
> is this what you are looking for?
> On Thu, Mar 3, 2011 at 7:50 PM, Ben Robinson <brobinson at lsnetworks.net>
> wrote:
>>
>> Greetings,
>>
>>
>>
>> I’m using route reflection on 7750-SR (8.0R7) and want to set next hop
>> self for routes learned from external BGP peers, but not on routes learned
>> from internal BGP peers. The goal is to reflect routes from internal peers,
>> preserving the IGP next hop while setting next hop self on routes from
>> external peers. Perhaps this is the default behavior.
>>
>>
>>
>> I can set all routes to next hop self in the 7750 Peer/Group configuration
>> and with a policy. Since I don’t want all routes advertised internally by
>> the 7750 to have the next hop self set, I’m assuming that it is accomplished
>> in a policy.
>>
>>
>>
>> Firstly, does anyone know if this is the default behavior? Or, if
>> possible, how to accomplish this with SROS policy.
>>
>>
>>
>> The Juniper policy equivalent is:
>>
>>
>>
>> term external {
>>
>>     from route-type external;
>>
>>     then {
>>
>>         next-hop self;
>>
>>         accept;
>>
>>     }
>>
>> }
>>
>> term internal {
>>
>>     from route-type internal;
>>
>>     then accept;
>>
>> }
>>
>>
>>
>> …
>>
>>
>>
>> Policy nhs-ipv6:
>>
>>     Term external:
>>
>>         from route-type external
>>
>>         then nexthop self accept
>>
>>     Term internal:
>>
>>         from route-type internal
>>
>>         then accept
>>
>>
>>
>>
>>
>> Thanks,
>>
>>
>>
>>
>>
>> Ben Robinson
>>
>> Systems Engineer
>>
>> LS Networks, Inc.
>>
>>
>
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