Routing

Hi All !

I have some questions relative to v6 peering overa IPv4 BGP sessions.

I have R1 <=> C1, with family inet and inet.6 unicast configured.

1. C1 advertise IPv6 routes to R1

toto@C1# run show route advertising-protocol bgp 192.168.4.0 

inet.0: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)
  Prefix                  Nexthop              MED     Lclpref    AS path
* 192.4.0.0/24            Self                                    I
* 192.4.0.1/32            Self                                    I
* 192.4.1.0/24            Self                                    I
* 192.4.2.0/24            Self                                    I
* 192.4.3.0/24            Self                                    I

inet6.0: 10 destinations, 10 routes (10 active, 0 holddown, 0 hidden)
  Prefix                  Nexthop              MED     Lclpref    AS path
* 2004:fff0::/32          Self                                    I
* 2004:fff0::1/128        Self                                    I
* 2004:fff1::/32          Self                                    I
* 2004:fff2::/32          Self                                    I
* 2004:fff3::/32          Self                                    I

2. R1 doesn't not accept the IPv6 route until a set "accept-remote-nexthop". But after that my IPv6 still stay hidden :

toto@R1# run show route receive-protocol bgp 192.168.4.1 hidden    

inet.0: 30 destinations, 30 routes (30 active, 0 holddown, 0 hidden)

inet.3: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)

iso.0: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)

mpls.0: 10 destinations, 10 routes (10 active, 0 holddown, 0 hidden)

inet6.0: 12 destinations, 17 routes (7 active, 0 holddown, 5 hidden)
  Prefix                  Nexthop              MED     Lclpref    AS path
  2004:fff0::/32          ::ffff:192.168.4.1                      65004 I
  2004:fff0::1/128        ::ffff:192.168.4.1                      65004 I
  2004:fff1::/32          ::ffff:192.168.4.1                      65004 I
  2004:fff2::/32          ::ffff:192.168.4.1                      65004 I
  2004:fff3::/32          ::ffff:192.168.4.1                      65004 I

inet6.3: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden)

3. I know that the routes are hidden because the next-hope is not reacheable. I'm using JunOS 10.4R8 and I have configured the interface like this :

ge-0/0/8 {
    unit 204 {
        description "C4 connection";
        vlan-id 204;
        family inet {
            address 192.168.4.0/31;
        }
        family inet6 {
            address ::192.168.4.0/127;
        }
    }
}

4. I know how I can solve the problem : is to replace ::192.168.4.0 with ::ffff:192.168.4.0

5. My question is : is it the only solution ?

Thanks for your help

Salah

Hi, 

Set the next-hop to peer address on the received route.

Apply the below policy in the import direction on the ebgp neighbour..

lab@Juniper1# show policy-options policy-statement test-import
term 1 {
then {
next-hop peer-address;
}
}

[edit]
lab@Juniper1#

Regards

Satinder Singh

yeah that works !

Thanks !

Well actually it doesn' work...

When I update the next-hop with a policy, the route is not hidden anymore, but the I can't not reach the other customer (6PE),

When I update the ip address on the interface, ie when I use an IPv6 address like ::ffff:x.x.x.x it works !

Any thing I forget ?

--
Salah

More details :

Well I found that we can't have a mix, ie R1 configured with IPv6 address like ::x.x.x.x and C1 configured with IPv6 address like ffff:x.x.x.x

Thanks for your help...

--

Salah