Apply by doing:
       cd /usr/src
       patch -p0 < 010_bgpd.patch

And then rebuild and install bgpd:
       cd usr.sbin/bgpd
       make depend
       make
       make install

Index: usr.sbin/bgpd/rde_attr.c
===================================================================
RCS file: /cvs/src/usr.sbin/bgpd/rde_attr.c,v
retrieving revision 1.76
diff -u -p -r1.76 rde_attr.c
--- usr.sbin/bgpd/rde_attr.c    8 May 2008 09:51:46 -0000       1.76
+++ usr.sbin/bgpd/rde_attr.c    18 Feb 2009 20:02:41 -0000
@@ -832,6 +832,8 @@ aspath_prepend(struct aspath *asp, u_int
               size = 0;
       }

+       if (quantum > 255)
+               fatalx("aspath_prepend: preposterous prepend");
       if (quantum == 0) {
               /* no change needed but return a copy */
               p = malloc(asp->len);
@@ -843,7 +845,10 @@ aspath_prepend(struct aspath *asp, u_int
       } else if (type == AS_SET || size + quantum > 255) {
               /* need to attach a new AS_SEQUENCE */
               l = 2 + quantum * sizeof(u_int32_t) + asp->len;
-               overflow = type == AS_SET ? quantum : (size + quantum) & 0xff;
+               if (type == AS_SET)
+                       overflow = quantum;
+               else
+                       overflow = size + quantum - 255;
       } else
               l = quantum * sizeof(u_int32_t) + asp->len;

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