Why is link L8 on B3 listed as "designated" ? Links L7 and L8 are on the same LAN, so, only one link can be designated, the other one should be backup, shouldn't it ?
I don't understand what the forwarding address field in an AS-external-LSA represents and what is it used for.
- Is it the address of an AS boundary router in another AS ? But this information is useful only to the AS boundary router which originated the LSA, so why inform every one of it ?
- Is it the address of the router, in this AS, toward which traffic had to be send to reach the network described in link state id (in LSA header) ? But in this case, the forwarding address will always be the same as the advertising router (unless AS boundary router advertise routes to a linked AS through another AS boundary router).
In the example on p.73, the forwarding address is set to 0.0.0.0, what does this value means ?
- Is it to describe a default route ?
- Is a special value which means "advertising router" ?
Router 10.1.1.1 announce an infinite distance to AS boundary router 10.1.1.1 which is the same router. So 10.1.1.1 announce an infinite distance to itself ! Is it correct ?
Posted by René Giller on Tuesday 13 February 2007 at 18:38