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From: "Stephen Sprunk" <ssprunk@cisco.com> To: <Brennan_Murphy@NAI.com>, <nanog@merit.edu> Date: Thu, 22 Aug 2002 09:06:12 -0500 Errors-To: owner-nanog-outgoing@merit.edu Thus spake <Brennan_Murphy@NAI.com> > I have a Frame connection between two sites, A and B. If the router > crashes at B, wouldn't A still see the DLCI for > B? Is there any scenario where this wouldn't be the case? If > B gets blown off the map, shouldnt A's frame interface be > in at least an up/down scenario? In theory, when the remote LMI goes down, or any part of the PVC internal to the carrier goes down, the local LMI should go INACTIVE. In practice, this is unreliable at best; for some carriers, you will always get ACTIVE status no matter what. ATM has a similar feature/problem with ILMI. The only solution is to ignore the carrier and do it yourself end-to-end (gosh, where have we heard that before?). End-to-End Keepalives for FR: http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/wan_r/wr dfrely.htm#xtocid18 OAM Loopback for ATM: http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/wan_r/wro ampvc.htm#xtocid0 > If the DLCI disappeared, doesn't that suggest that someone > deleted the PVC? Distinguish between INACTIVE and DELETED; those represent very different things in LMI. S
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