[j-nsp] JNCIP EBGP Case Study...

[Sean Clarke]

Are you doing "Next hop self" on R1 to advertise to R3, or are you 
trying to send the routes without R3 knowing anything about the eBGP 
next-hop 10.0.5.254 ?  If the latter, advertise the link between R1 and 
P1 passively towards R3


On 10/29/09 9:27 AM, Hoogen wrote:
> Well I am working with my J-Series routers to do most topologies.. This
> problem has somehow baffled me alot. Any help is greatly appreciated...
>
> A part of topology.. I think the problem lies somewhere in this...
>
> P1---R1---R3 (Both R1 and R3 are in 65000... and R1 is peering with P1 which
> is AS 1492)
>
> R1 receives
>
> lab at R1# run show route receive-protocol bgp 10.0.5.254
>
> inet.0: 65 destinations, 69 routes (63 active, 0 holddown, 4 hidden)
>    Prefix                  Nexthop              MED     Lclpref    AS path
> * 3.4.0.0/20              10.0.5.254                              1492 I
> * 6.0.0.0/7               10.0.5.254                              1492 I
> * 120.120.0.0/24          10.0.5.254                              1492 I
> * 120.120.1.0/24          10.0.5.254                              1492 I
> * 120.120.2.0/24          10.0.5.254                              1492 I
> * 120.120.3.0/24          10.0.5.254                              1492 I
> * 120.120.4.0/24          10.0.5.254                              1492 I
> * 120.120.5.0/24          10.0.5.254                              1492 I
> * 120.120.6.0/24          10.0.5.254                              1492 I
> * 120.120.7.0/24          10.0.5.254                              1492 I
> * 120.120.69.128/25       10.0.5.254                              1492 I
>
> __juniper_private1__.inet.0: 2 destinations, 2 routes (2 active, 0 holddown,
> 0 hidden)
>
> iso.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)
>
> [edit]
> lab at R1#
>
> And then R1 sends this to R3
>
> lab at R1# run show route advertising-protocol bgp 10.0.3.3
>
> inet.0: 65 destinations, 69 routes (63 active, 0 holddown, 4 hidden)
>    Prefix                  Nexthop              MED     Lclpref    AS path
> * 3.4.0.0/20              10.0.5.254                   100        65412
> 65412 1492 I
> * 6.0.0.0/7               10.0.5.254                   100        65412
> 65412 1492 I
> * 120.120.0.0/24          10.0.5.254                   100        65412
> 65412 1492 I
> * 120.120.1.0/24          10.0.5.254                   100        65412
> 65412 1492 I
> * 120.120.2.0/24          10.0.5.254                   100        65412
> 65412 1492 I
> * 120.120.3.0/24          10.0.5.254                   100        65412
> 65412 1492 I
> * 120.120.4.0/24          10.0.5.254                   100        65412
> 65412 1492 I
> * 120.120.5.0/24          10.0.5.254                   100        65412
> 65412 1492 I
> * 120.120.6.0/24          10.0.5.254                   100        65412
> 65412 1492 I
> * 120.120.7.0/24          10.0.5.254                   100        65412
> 65412 1492 I
> * 120.120.69.128/25       10.0.5.254                   100        65412
> 65412 1492 I
> * 192.168.10.0/24         Self                         100        I
> * 192.168.100.0/24        Self                 101     101        I
>
> [edit]
> lab at R1#
>
> So far so good...
>
> Now R3 only receives
>
> lab at R3# run show route receive-protocol bgp 10.0.6.1
>
> inet.0: 66 destinations, 106 routes (63 active, 0 holddown, 17 hidden)
>    Prefix                  Nexthop              MED     Lclpref    AS path
> * 192.168.10.0/24         10.0.6.1                     100        I
> * 192.168.100.0/24        10.0.6.1             101     101        I
>
> __juniper_private1__.inet.0: 2 destinations, 2 routes (2 active, 0 holddown,
> 0 hidden)
>
> iso.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)
>
> [edit]
> lab at R3#
>
> I check to see if I have an import policy but it's not present... I am not
> sure why I am not receiving any routes from R1 except for those internal
> routes...
>
> group 65000 {
>      type internal;
>      local-address 10.0.3.3;
>      export ibgp;
>      neighbor 10.0.6.1;
> }
>
> As you notice there is no policy to deny any routes.. Can someone help me
> out here..
>
> -Hoogen
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