interas-out
Tony Bates
Fri Sep 9 23:59:17 CEST 1994
cengiz at ISI.EDU (Cengiz Alaettinoglu) writes: * * By the way, the format of interas-out on page 45 and format used in * the examples do not match in the placement of <metric>. In my program, I * am assuming the one in the examples since that one is consistent with * interas-in. Please let me know if the other format is the right one. * * Regards. * * Cengiz * Cengiz, I noticed this the other day and made the correction to the current text but didn't feel it warrented a new update until we resolved the other issues. Anyway, find below the "current" text for interas-out --Tony. interas-out: Format: to <aut-num> <local-rid> <neighbor-rid> [<metric>] announce <routing policy expression> The keywords to and announce are optional and can be omit- ted. The definitions of <aut-num>, <local-rid> <neighbor-rid>, ripe-1nn.txt August, 1994 - 54 - and <routing policy expression> are identical to those defined in interas-in. <metric> is optional and is defined as follows: (<metric-type>=<value>) It should be noted the parenthesis ``('' and ``)'' and the keywords of ``<metric-type>'' must be present for this metric to be valid. <metric-type> currently only supports "metric-out". It could be expanded to other type of preference such as TOS/QOS as routing technology matures. <value> can take one of the following values: <num-metric> <num-metric> is a pre-configured metric for outbound routes. The lower the cost the more preferred the route. This <num-metric> value is literally passed by the routing protocol to the neighbor. It is expected that it is used there which is indicated by pref=MED on the corresponding interas-in attribute. It should be noted that whether to accept the outgoing metric or not is totally within the discretion of the neigh- bor AS. IGP This indicates that the metric reflects the ASs internal topology cost. The topology is reflected here by using MED which is derived from the AS's IGP metric. NOTE: Combinations of IGP and <num-metric> should be avoided for the same destinations. CAVEAT: The metric-out values may well be enhanced in the future as more interas protocols make use of metrics. Examples: interas-out: to AS1104 192.87.45.254/32 192.87.45.80/32 (metric-out=10) announce AS23 AS10 interas-out: to AS1104 192.87.45.254/32 192.87.45.80/32 (metric-out=15) announce AS10 interas-out: to AS1103 192.87.45.254/32 192.87.45.80/32 (metric-out=IGP) announce ANY Status: optional, multiple lines allowed -------- Logged at Mon Sep 12 20:53:49 MET DST 1994 ---------
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