|>|I believe administrative distance is a Cisco proprietary thing and is |>|not transmitted via OSPF. The Arc's don't seem to have nearly the |>|control over route redistribution and such that the Cisco's do. :/ | |>Actually its not a Cisco thing. Its called Internal Distance in the RFC. |>This information is used for tie breaking when equal cost routes |are present |>and the admin does have a preference. | |Uhm, no. Administrative distance is used in Cisco's to determine which |route to use when multiple routes are present in different routing |protocols. ie, connected routes have a lower admin distance (are |preferred) than statics, which are lower than eBGP, which is lower than |OSPF, which is lower than RIP, which is lower than iBGP. There are |others in there of course (IS-IS, Hello, EGP, etc.), but those are the |main ones. When you're putting in a static route, you can set it at a |specific administrative distance (ie, Mike was sticking them in at 250) |which means that the same route picked up by OSPF will be preferred over |the static one, when, by default, a static route will be used rather |than the OSPF. Much the same type of thing can be done with routing |protocols...for example, I have two cisco's redistributing routes from |RIP into OSPF on one network...this causes problems based on the |administrative distance...the solution was to tell one router to deal |with OSPF at a higher administrative distance than RIP (so it preferred |the RIP routes over OSPF). This prevented a nice loop in the routing |updates. :) This information is not transmitted in OSPF in any way. Hrm.. I used it in a Cisco OSPF environment.. Further reading reveals that you are correct. OSPF does have a similar feature in the internal distance. This information is also NOT transmitted and is intended to help the receiver make its final routing decision based on available information. -M - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.