Re: Inter-AS MPLS VPN

Vignesh,

There are two ways to disable ARF - by configuring the router as a RR or to
disable bgp default route-target filtering.

So by configuring R1 as a RR for VPNv4 routes you disabled it.

Jo

2009/9/11 Vignesh Sethuraman <sethuvignesh_at_gmail.com>

> Hi Jo,
>
> Thank you Jo. Excellent Explanation.
>
> But I am confused that even in R1 (RR) there are no VRF instance configured
> but how come R1(RR) alone accept that route from R2.
>
> Thanks,
> Vignesh.
>
>
> On Fri, Sep 11, 2009 at 9:09 PM, Jo Knight <joknight_at_gmail.com> wrote:
>
>> Vignesh,
>>
>> The ASBR will reject the routes that are reflected down from R1 as the
>> default behaviour is to reject VPNv4 routes that it does not have a VRF
>> instance for - this is called Automatic Route Filtering.
>>
>> There is no need for the ASBR to know about these routes, but if you
>> wanted them to show on the ASBR try adding this command to your BGP config.
>>
>> no bgp default route-target filter
>>
>> Jo
>>
>> 2009/9/11 Vignesh Sethuraman <sethuvignesh_at_gmail.com>
>>
>>> Hello Experts,
>>>
>>> In Option 3 (10C): Multi-Hop MP-eBGP Between RR and eBGP Between ASBRs -
>>> Inter-AS MPLS VPN, the routes are not learned by ASBR. This is an
>>> expected
>>> behavior. But I could not understand the reason.
>>>
>>> In my scenario R2 is the PE which redistribute the route 200.0.0.4/32into
>>> VPNV4 table, R1 is the RR which receives VPNV4 route from R2 and R5 is
>>> ASBR
>>> connected to other AS which is not receiving the route from RR. Though it
>>> is
>>> an expected behavior, Could someone explain the reason.
>>> *
>>> R2#sh ip bgp vpnv4 all | inc 200.0.0.4
>>> *> 200.0.0.4/32 150.50.24.1 1 32768
>>>
>>> R2#sh ip bgp vpnv4 all labels | inc 200.0.0.4
>>> 200.0.0.4/32 150.50.24.1 19/nolabel
>>>
>>> R1#sh ip bgp vpnv4 all | inc 200.0.0.4
>>> *>i200.0.0.4/32 200.0.0.2 1 100 0 ?
>>>
>>> R1#sh ip bgp vpnv4 all labels | inc 200.0.0.4
>>> 200.0.0.4/32 200.0.0.2 nolabel/19
>>>
>>> R5#sh ip bgp vpnv4 all
>>>
>>> R5#
>>>
>>> Thanks,
>>> Vignesh
>>>
>>>
>>> *
>>>
>>>
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Received on Fri Sep 11 2009 - 18:51:44 ART