[Xorp-users] [Xorp-hackers] Here's some bgp config files that work.

[Atanu Ghosh]

Hi,

The test for the nexthop being zero is in
FastPathAttributeList<A>::load_raw_data:

                // if there's an NLRI, there must be a non-zero nexthop
                if (do_checks && mp4_reach_att->nexthop() == IPv4::ZERO()) {
                    uint8_t data = NEXT_HOP;
                    xorp_throw(CorruptMessage,"Illegal nexthop", UPDATEMSGERR,
                               MISSWATTR, &data, 1);
                }

I don't know why it isn't being caught here.

       Atanu.

On Tue, Apr 20, 2010 at 2:59 PM, Ben Greear <greearb at candelatech.com> wrote:
> I seem to have BGP working now, at least to some degree.
>
> I fixed one exception that was thrown when route destination
> is 0.0.0.0 (pushed the fix to xorp.ct), and it's included
> below.
>
> The rest of my problems were self-inflicted mis-configuration of
> the peers and export policies.
>
> I'm attaching two working configurations in hopes they prove
> useful to someone.  There may still be issues with these,
> but it works enough for BGP to exchange routes and let clients
> attached to the two routers send traffic through them.
>
> Here's the fix for 0.0.0.0 destination.  It should also
> just catch the exception and ignore the route instead
> of crash..but that's a fix for another day.
>
> [greearb at ben-dt2 libxorp]$ git diff
> diff --git a/bgp/path_attribute.cc b/bgp/path_attribute.cc
> index f1326b2..b82475c 100644
> --- a/bgp/path_attribute.cc
> +++ b/bgp/path_attribute.cc
> @@ -318,7 +318,7 @@ NextHopAttribute<A>::NextHopAttribute(const uint8_t* d)
>
>     _next_hop = A(payload(d));
>
> -    if (!_next_hop.is_unicast())
> +    if (!(_next_hop.is_unicast() || _next_hop.is_zero()))
>        xorp_throw(CorruptMessage,
>                   c_format("NextHop %s is not a unicast address",
>                            _next_hop.str().c_str()),
>
>
> Thanks,
> Ben
>
> --
> Ben Greear <greearb at candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>
>
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