Hi Mark,
There is actually an RFC about HSRP it is RFC2281:
http://www.ietf.org/rfc/rfc2281.txt?number=2281
>From this RFC, this might clear most of your confusion:
+ If the virtual IP address is configured, set state 3 (Listen) If
the virtual IP address is not configured, set state 2 (Learn).
Look at the RFC for all the details.
Willy Schoots
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Mark Odette II
Sent: Sunday, July 29, 2001 11:08 AM
To: [EMAIL PROTECTED]
Subject: HSRP running states [7:14074]
Howard, Priscilla, et al.-
I'm working on knocking out the BCMSN exam, and am re-covering HSRP -(which
I
have read many on this list to state that it probably won't hardly be on the
test, but I don't care)
Here's my delima I'm a logical thinker, and going over the 6 different
states of HSRP, I find myself asking WHY about a specific statement made in
all the study materials... the WHY is about the following.
Taken from Sybex Switching Study Guide, Pg 314, it explains the 6 states in
simple terms. Specifically, it says " the router enters the Learn state
when
it has not heard from the Active router"... this part I can accept, and it
makes since. It continues to say " It does not know the active router
[which
still makes since, since it hasn't heard from it yet] and does not know the
IP
of the Virtual Router." The second half of this last statement is what I
don't understand.
When configuring HSRP, you configure on the Interface (ex: FastEthernet 0/0)
[Standby] <-- HSRP [1] <-- HSRP Group assignment id, which is also optional
[IP 10.1.0.200] <-- Virtual Router ip address.
If you specify the VR IP address, why on earth does the router NOT know the
VR
IP address in the Learn State. Does it simply ignore this config parameter
when initializing HSRP and only reference it when it A) finds itself to be
the
first one to be Active router after already going through all the other
states, or B) When it finds itself to be next in line (because of priority)
when the Active router disappears for longer than the hello/holdtime
interval,
and it suddenly experiences "amnesia" and has to look at its own config to
go
'Oh yeah, Everybody, I'm now the active router for... uh... let see. oh,
right, virtual router 10.1.0.200... got it!'
I guess my logic failure is in that I don't see anything about when the VR
IP
Addr part of the config statement is referenced, if in fact the way the
whole
group gets together and decides on who's big man on campus is from hello
messages with elections being dependent upon Priority specs.
Reading the definition of the next state in the process eludes to the
understanding that it learns of both the active router's address and the
virtual router's address from the hello message. Is this a human error on
my
part in that it appears to be an assumption I'm making??
Since this is a Cisco Protocol, is there an RFC on it that I could reference
for my clarification needs??
Thanks,
Mark Odette II
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=14076&t=14074
--
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
