From: Scott Livingston (scottl@xxxxxxxxxxxxxxxxx)
Date: Mon Jul 22 2002 - 10:56:27 GMT-3
On the drive home after my post I realized I didn't throw that
Split-Horizon's caveat out there. If after careful examination of your
network you know you can live w/out SH turn it off on the Ethernet
segment, or run an IGP like OSPF that will not care.
-Scott
-----Original Message-----
From: Scott Livingston [mailto:scottl@sprinthosting.net]
Sent: Friday, July 19, 2002 4:52 PM
To: 'Kelly Cobean'; 'ccielab'
Subject: RE: hsrp track problem?
Kelly,
Good question.
Short Answer = Yes
I based my answer to original question #2 with a belief that the newly
elected router (B) will send traffic back to old HSRP primary router (A)
so long as there is some sort of IGP or BGP relationship between (A & B)
and router (A) has a better metric to destination. *Of course the
important thing is to make sure you have some sort of IGP or BGP
relationship between the two routers.*
-Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Kelly Cobean
Sent: Friday, July 19, 2002 3:09 PM
To: ccielab
Subject: RE: hsrp track problem?
Scott,
I had this big long post all ready to send detailing how I think you
are
wrong with your answer to question #2 because of the automatic disabling
of
ICMP-redirects in pre 12.1.3T code, and the restrictions placed on HSRP
and
ICMP-redirects in post-12.1.3T code. As I was typing, I realized what
you
were saying, and I came upon a question that I'm unable to answer....So
here
it is... and the answer to this determines whether you are in fact right
or
wrong. Anybody please chime in...
In the original posters scenario where routerA is the active router and
has
2 serial links, if one of the links goes down and that causes routerB to
send a coup message and take over as the active router, because the
routing
table has not changed from a reachability perspective, will routerB (now
the
active router) receive data on the virtual IP address and then send the
data
BACK out the same interface to routerA if routerA has the better metric
to
the destination?
Kelly Cobean, CCNP, CCSA, ACSA, MCSE, MCP+I
Network Engineer
AT&T Government Solutions, Inc.
Disclaimer:
The opinions expressed herein are those of the author alone, and do not
necessarily relfect those of AT&T Government Solutions, Inc., it's
management, or it's affiliates.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Scott Livingston
Sent: Friday, July 19, 2002 10:57 AM
To: 'chenyan'; 'ccielab'
Subject: RE: hsrp track problem?
Please, someone correct me if I am wrong.
The answer to your first question is "NO". The other interfaces will
not go down as a RESULT of HSRP; obviously if we are talking about
subinterfaces they could, depending on the designed solution or whatever
caused the original interface to drop, but not as a result of HSRP,
rather FR, or even an ATM setup could be the demise of the remaining
interfaces.
The answer to your second question is it "Depends". What I mean by that
is the routing protocol will be the decision maker on destination
traffic. If the original link is still the best route then it will be
traversed - if the gear is configured to do so. On the other hand, if
by defaulting to the new router you are sourcing from a better metric
you will take the new link to your destination. I am sure some others
can think of a few more hypothetical scenarios for this one, but
hopefully this gives you some food for thought.
Scott
Sprint E|Solutions
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
chenyan
Sent: Friday, July 19, 2002 2:54 AM
To: ccielab
Subject: hsrp track problem?
hi,guys,
when configging the hsrp track for more than one serial links, I got a
problem:
when one tracked serial link down, the active router will reduce it
priority by 10 default, if it's priority is less than the priority of
standby router, it is possible that the standby router will change to a
active router? If it does,
will the other tracked serial links of the original active router
shutdown ?
will the traffic through the original good serial link be changed to
flow through the present active router?
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:36:39 GMT-3