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Implements IGP metric comparison for BGP routes.

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This commit is contained in:
Ondrej Zajicek
2010-07-31 01:04:32 +02:00
parent ac3ac49a71
commit d1e146f2f8
7 changed files with 82 additions and 11 deletions
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22
proto/bgp/attrs.c
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@@ -1084,8 +1084,13 @@ bgp_rte_better(rte *new, rte *old)
if (new_bgp->is_internal < old_bgp->is_internal)
return 1;
/* Skipping RFC 4271 9.1.2.2. e) */
/* We don't have interior distances */
/* RFC 4271 9.1.2.2. e) Compare IGP metrics */
n = new_bgp->cf->igp_metric ? new->attrs->igp_metric : 0;
o = old_bgp->cf->igp_metric ? old->attrs->igp_metric : 0;
if (n < o)
return 1;
if (n > o)
return 0;
/* RFC 4271 9.1.2.2. f) Compare BGP identifiers */
/* RFC 4456 9. a) Use ORIGINATOR_ID instead of local neighor ID */
@@ -1494,7 +1499,18 @@ bgp_get_route_info(rte *e, byte *buf, ea_list *attrs)
eattr *o = ea_find(attrs, EA_CODE(EAP_BGP, BA_ORIGIN));
u32 origas;
buf += bsprintf(buf, " (%d) [", e->pref);
buf += bsprintf(buf, " (%d", e->pref);
if (e->attrs->hostentry)
{
if (!e->attrs->iface)
buf += bsprintf(buf, "/-");
else if (e->attrs->igp_metric >= IGP_METRIC_UNKNOWN)
buf += bsprintf(buf, "/?");
else
buf += bsprintf(buf, "/%d", e->attrs->igp_metric);
}
buf += bsprintf(buf, ") [");
if (p && as_path_get_last(p->u.ptr, &origas))
buf += bsprintf(buf, "AS%u", origas);
if (o)