[j-nsp] iBGP and IPv6

Jonathan Call lordsith49 at hotmail.com
Wed Apr 15 14:23:47 EDT 2015

OSPF/OSPFv3 are the IGP, which apparently are feeding back into IBGP:

With OSPFv3 enabled:
2001:db8:4000::1/128*[Direct/0] 1w0d 21:13:49
                   > via lo0.1
                    [OSPF3/10] 1w0d 21:13:44, metric 0
                   > via lo0.1
                    [BGP/170] 00:00:18, MED 1, localpref 100, from 2001:db8:4000::2
                      AS path: I
                   > to fe80:db8:4000:1::3 via ge-0/0/8.0

With OSPFv3 disabled:
vr-1.inet6.0: 8 destinations, 9 routes (8 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

2001:db8:4000::1/128*[Direct/0] 1w0d 21:10:41
                   > via lo0.1
                    [OSPF3/10] 1w0d 21:10:36, metric 0
                   > via lo0.1

Limiting IBGP to only export directly connected routes would prevent this. It still does not explain why router1 will mark the IPv4 loopback route it received as hidden/unusable but the IPv6 loopback route is not.


Subject: Re: [j-nsp] iBGP and IPv6
To: lordsith49 at hotmail.com; juniper-nsp at puck.nether.net
From: mark.tinka at seacom.mu
Date: Wed, 15 Apr 2015 18:02:30 +0200



    On 15/Apr/15 17:43, Jonathan Call

      Correct.  The BGP route for the router's IPv4
        loopback is marked as hidden/unusable. It does not show up in
        show route extensive output.

    Is this Loopback IPv4 address known by any other routing protocol,
    e.g., an IGP?



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