From: Marvin Greenlee (mgreenlee@ipexpert.com)
Date: Tue Jul 08 2008 - 14:12:29 ART
You're not expected to have "instantaneous convergence". Obviously if there
is a failure it may take some period of time before the other path is
learned.
However, if things never converge, or if the networks become unstable/start
flapping due to route loops, etc, it could cause problems. If they want
things to stabilize within a certain period of time, they would tell you in
the section.
Marvin Greenlee, CCIE #12237 (R&S, SP, Sec)
Senior Technical Instructor - IPexpert, Inc.
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
Mailto: mgreenlee@ipexpert.com
Progress or excuses, which one are you making?
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Nate
Cielieska
Sent: Tuesday, July 08, 2008 1:08 PM
To: Cisco certification
Subject: Backup or Redundant routing question (General)
All,
So as the lab date draws near, conspiracy theories and thinking way to much
about the day itself comes into play.
Say i have a situation where a fault tolerant link is required to come up on
failure of a primary link. With that link coming up, the routing domain
changes and things start to move. For instance, say i have a backup
interface kicking up and eigrp routes flowing to/from it. At an upstream
point that EIGRP is being redistributed into RIP (which was the primary
links routing protocol). Further upstream RIP is being redistributed into
OSPF.
Requirement being to allow the OSPF speaking routers to be able to route to
a particular network in case of a failure.
My question is this: If a primary link and subsequently an interface
speaking a routing protocol dies.. how long is acceptable if a failure
occurs to meet the requirement that the OSPF network "has connectivity" to
the networks affected by the failed link? Is there a general concensus on
this.
Dont break the NDA please but more of an interpretation thing. In your mind
does "have connectivity" mean immediate communication or does "have
connectivity" mean after the primary routing protocol times out?
Hope this makes sense, it barely makes sense to me but its the best i could
do to formulate the thought.
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