[j-nsp] BGP route-target filtering issue

[Ivan Ivanov]

Hi,

Check this link -
https://www.juniper.net/documentation/en_US/junos/topics/concept/vpn-proxy-bgp-route-target-filtering-understanding.html

If you configure the rest of the routers with family route-target r3 and r4
will stop sending the proxy route you see. Or just use RR.

Ivan,

On Tue, Jun 6, 2017 at 9:01 PM, Mihai <mihaigabriel at gmail.com> wrote:

> Update: using route policies with rtf-prefix-list works, but
> rtf-prefix-lists are supported from Junos 12.2 and I have devices with
> older software.
> I am more interested if this is a 'normal' behavior.
>
> Regards,
> Mihai
>
>
> On 06/06/2017 07:41 PM, Mihai wrote:
>
>> Hi,
>>
>>  I have three routers (r1,r3,r4) and a full mesh IBGP between them.
>> R1 is configured with inet-vpn , R3 and R4 with inet-vpn and route-target.
>>
>> r1# show protocols bgp
>> group IBGP {
>>     type internal;
>>     local-address 1.1.1.1;
>>     family inet-vpn {
>>         unicast;
>>     }
>>     neighbor 3.3.3.3;
>>     neighbor 4.4.4.4;
>> }
>>
>> r3# show protocols bgp
>> group IBGP {
>>     type internal;
>>     local-address 3.3.3.3;
>>     family inet-vpn {
>>         unicast;
>>     }
>>     family route-target;
>>     neighbor 1.1.1.1;
>>     neighbor 4.4.4.4;
>> }
>>
>> r4# show protocols bgp
>> group IBGP {
>>     type internal;
>>     local-address 4.4.4.4;
>>     family inet-vpn {
>>         unicast;
>>     }
>>     family route-target;
>>     neighbor 1.1.1.1;
>>     neighbor 3.3.3.3;
>> }
>>
>> I don't understand why R3 and R4 are advertising the default rt route
>> (0:0:0/0) in this topology as I am not using route reflectors.
>>
>> r3# run show  table bgp.rt
>> Jun 06 18:10:05
>>
>> bgp.rtarget.0: 1 destinations, 2 routes (1 active, 0 holddown, 0 hidden)
>>
>> + = Active Route, - = Last Active, * = Both
>>
>> 0:0:0/0
>>                    *[RTarget/5] 00:10:46
>>                       Type Default
>>                       Local
>>                     [BGP/170] 00:10:42, localpref 100, from 4.4.4.4
>>                       AS path: I, validation-state: unverified
>>                     > to 10.0.2.6 via ge-0/0/4.34
>>
>> r4# run show  table bgp.rt
>>
>> bgp.rtarget.0: 1 destinations, 2 routes (1 active, 0 holddown, 0 hidden)
>> + = Active Route, - = Last Active, * = Both
>>
>> 0:0:0/0
>>                    *[RTarget/5] 00:11:13
>>                       Type Default
>>                       Local
>>                     [BGP/170] 00:11:09, localpref 100, from 3.3.3.3
>>                       AS path: I, validation-state: unverified
>>                     > to 10.0.2.5 via ge-0/0/3.34
>>
>> If I want to create a VRF/L2VPN/VPLS on R3 (first) and R4 (later) the
>> service will be down because R3 will not readvertise the VRF/L2VPN/VPLS
>> when is receiving the VPN RT/ROUTE from R4.
>> The only solution to get the R3 VPN route on R4 is by requesting it with
>> a ROUTE REFRESH (clear soft-inbound) from R4.
>>
>> This has been tested on Junos 13.3 and 14.1.
>>
>> PS: I don't want to configure R3/R4 with "keep all" and I can't make any
>> configuration that will reset the BGP sessions.
>>
>> Does this look like a BUG?
>>
>> Regards,
>> Mihai
>>
>> _______________________________________________
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-- 
Best Regards!

Ivan Ivanov