From: Kenneth Wygand (KWygand@customonline.com)
Date: Tue May 25 2004 - 19:27:46 GMT-3
You got it Scott! :)
Ken
-----Original Message-----
From: Scott, Tyson C [mailto:tyson.scott@hp.com]
Sent: Tue 5/25/2004 5:17 PM
To: Kenneth Wygand; Church, Chuck; Ahmed Mustafa; ccielab@groupstudy.com
Cc:
Subject: RE: Quiz Question of the Day 20040520
An ACL blocking the multicast address could cause this to occur.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Kenneth Wygand
Sent: Thursday, May 20, 2004 9:34 PM
To: Church, Chuck; Ahmed Mustafa; ccielab@groupstudy.com
Subject: Quiz Question of the Day 20040520
Hello everybody!
Quiz question for the day - this is a snip-it of "debug standby" and
"debug IP packet" of an HSRP negotiation. What are some possible
reasons why this is happening? (I know the answer, I broke it on
purpose). You can tell me technically (i.e. because you are missing a
command blah blah blah) or theoretically (i.e. the LSA exchange between
the two OSPF neighbors is not exchanging blah blah blah...). If you
think you have the right answer, lab it up and see if you can reproduce
the following output!
Good luck!
Ken
<snip>
15:32:06: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:06: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:06: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:07: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:07: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:09: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:09: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:09: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:09: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:10: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:10: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:11: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:11: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:11: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:11: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:13: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:13: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:14: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:15: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:15: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:15: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:16: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:16: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:17: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:17: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:17: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:17: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:18: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:18: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:20: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:20: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:20: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:20: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:21: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:21: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:23: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:23: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:23: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:23: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:24: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:24: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:25: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:25: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:25: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:25: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:27: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:27: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:28: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:28: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:28: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:28: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:30: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:30: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:31: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:31: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:31: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:31: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:32: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:32: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:34: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:34: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:34: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:34: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:35: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:35: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:37: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:37: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:37: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:37: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:37: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:37: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:40: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:40: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:40: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:40: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:40: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:40: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:42: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:42: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:42: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:42: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:43: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:43: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicastu al
15:32:46: IP: s=12.12.12.1 (Ethernet0), d=224.0.0.2, len 48, rcvd 2
15:32:46: SB0:Ethernet0 Hello in 12.12.12.1 Active pri 90 hel 3 hol 10
ip 12.12.
12.254
15:32:46: SB0:Ethernet0 Coup out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12.
12.254
15:32:46: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
ad/multicast
15:32:46: SB0:Ethernet0 Hello out 12.12.12.2 Active pri 95 hel 3 hol 10
ip 12.12
.12.254
15:32:46: IP: s=12.12.12.2 (local), d=224.0.0.2 (Ethernet0), len 48,
sending bro
al
All possible debugging has been turned off
r2#d/multicast
r2#
</snip>
-----Original Message-----
From: nobody@groupstudy.com on behalf of Church, Chuck
Sent: Sun 5/16/2004 5:05 PM
To: Ahmed Mustafa; ccielab@groupstudy.com
Cc:
Subject: RE: HSRP
Picture 2 routers, each with a single connection to the LAN
(where the
HSRP is run) and a single WAN connection, each to the same
destination.
You want router 'A' to be the active HSRP router, because it's
WAN
connection is a DS-3. Router 'B' has a T1. So you tell router
'A' to
preempt, because if the DS-3 is up, you want it to assume the
HSRP
address right away. On the other hand, if 'B' becomes the
higher
priority HSRP router, it's because 'A' lowered it's priority due
to the
tracking of the failed DS-3. So you'd want 'B' to be able to
preempt
also. Hope that clears it up.
Chuck Church
Lead Design Engineer
CCIE #8776, MCNE, MCSE
Wam!Net Government Services - Design & Implementation Team
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch@wamnetgov.com
PGP key:
http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.
com
-----Original Message-----
From: Ahmed Mustafa [mailto:ahmed.mustafa@sbcglobal.net]
Sent: Sunday, May 16, 2004 2:44 PM
To: Church, Chuck
Subject: Re: HSRP
Is there any practical example you can give. Why would you want
to
configure preempt at both ends if tracking is configured.
----- Original Message -----
From: "Church, Chuck" <cchurch@wamnetgov.com>
To: <EdmondsSG@aol.com>; <james@net-brigade.com>;
<ahmed.mustafa@sbcglobal.net>; <ccielab@groupstudy.com>
Sent: Sunday, May 16, 2004 9:41 AM
Subject: RE: HSRP
> That's the exception. If you're using tracking and the
priority can
> shift from one side to the other, then you'd want preempt on
both. I
> was basing what I said on the example given. Sorry if I
confused
> anyone.
>
>
> Chuck Church
> Lead Design Engineer
> CCIE #8776, MCNE, MCSE
> Wam!Net Government Services - Design & Implementation Team
> 13665 Dulles Technology Dr. Ste 250
> Herndon, VA 20171
> Office: 703-480-2569
> Cell: 703-819-3495
> cchurch@wamnetgov.com
> PGP key:
>
http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.
> com
>
>
>
>
> _____
>
> From: EdmondsSG@aol.com [mailto:EdmondsSG@aol.com]
> Sent: Sunday, May 16, 2004 11:59 AM
> To: Church, Chuck; james@net-brigade.com;
ahmed.mustafa@sbcglobal.net;
> ccielab@groupstudy.com
> Subject: Re: HSRP
>
>
> When you use 'standby track' command with HSRP - i belive you
need
> prempt on both sides.
>
> any comments?
>
> Simon
>
>
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This archive was generated by hypermail 2.1.4 : Wed Jun 02 2004 - 11:12:17 GMT-3