From: Kenneth Wygand (KWygand@customonline.com)
Date: Mon Oct 06 2003 - 20:50:55 GMT-3
Sam,
As you correctly assumed, an HSRP router will not promote itself until it receives a packet from it's neighbor with a LOWER priority than its own. See the inline explanation I provided.
02:52:01: SB0:Ethernet0 Hello out 10.0.0.1 Active pri 105 hel 3 hol 10 ip 10.0.0
.3
02:52:01: SB0:Ethernet0 Hello in 10.0.0.2 Standby pri 100 hel 3 hol 10 ip 10.0.0
.3
02:52:04: SB0:Ethernet0 Hello in 10.0.0.2 Standby pri 100 hel 3 hol 10 ip 10.0.0
.3
02:52:04: SB0:Ethernet0 Hello out 10.0.0.1 Active pri 105 hel 3 hol 10 ip 10.0.0
.3
02:52:04: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state
to down
02:52:04: SB0: Ethernet0 Now 0/1 tracked interfaces up
02:52:04: SB0: Ethernet0 Priority was 105 now 95, configured as 105
***************************************************
**********ADVERTISEMENT AS LOWER PRIORITY**********
***************************************************
02:52:04: SB0:Ethernet0 Hello out 10.0.0.1 Active pri 95 hel 3 hol 10 ip 10.0.0.
3
**********************************************************
**********PROMOTION BY SIDE WITH HIGHER PRIORITY**********
**********************************************************
02:52:04: SB0:Ethernet0 Coup in 10.0.0.2 Standby pri 100 hel 3 hol 10 ip 10.0.0.
3
02:52:04: %STANDBY-6-STATECHANGE: Standby: 0: Ethernet0 state Active -> Spea
k
02:52:04: SB0:Ethernet0 Resign out 10.0.0.1 Speak pri 95 hel 3 hol 10 ip 10.0.0.
3
02:52:04: SB0:Ethernet0 Hello out 10.0.0.1 Speak pri 95 hel 3 hol 10 ip 10.0.0.3
02:52:04: SB0:Ethernet0 Hello in 10.0.0.2 Active pri 100 hel 3 hol 10 ip 10.0.0.
3
02:52:07: SB0:Ethernet0 Hello in 10.0.0.2 Active pri 100 hel 3 hol 10 ip 10.0.0.
3
02:52:07: SB0:Ethernet0 Hello out 10.0.0.1 Speak pri 95 hel 3 hol 10 ip 10.0.0.3
02:52:10: SB0:Ethernet0 Hello out 10.0.0.1 Speak pri 95 hel 3 hol 10 ip 10.0.0.3
02:52:10: SB0:Ethernet0 Hello in 10.0.0.2 Active pri 100 hel 3 hol 10 ip 10.0.0.
3
02:52:12: SB0:Ethernet0 Hello in 10.0.0.2 Active pri 100 hel 3 hol 10 ip 10.0.0.
3
02:52:12: SB0:Ethernet0 Hello out 10.0.0.1 Speak pri 95 hel 3 hol 10 ip 10.0.0.3
02:52:14: %STANDBY-6-STATECHANGE: Standby: 0: Ethernet0 state Speak -> Stan
dby
02:52:14: SB0:Ethernet0 Hello out 10.0.0.1 Standby pri 95 hel 3 hol 10 ip 10.0.0
.3
02:52:15: SB0:Ethernet0 Hello in 10.0.0.2 Active pri 100 hel 3 hol 10 ip 10.0.0.
3
=====================================================
=====================================================
02:52:24: SB0:Ethernet0 Hello in 10.0.0.2 Active pri 100 hel 3 hol 10 ip 10.0.0.
3
02:52:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state
to up
02:52:24: SB0: Ethernet0 Now 1/1 tracked interfaces up
02:52:24: SB0: Ethernet0 Priority was 95 now 105, configured as 105
*******************************************
EVEN THOUGH THIS ROUTER KNOWS IT IS HIGHER
THAN THE OTHER SIDE, IT WAITS TO CONFIRM THAT THE
OTHER SIDE IS INDEED OF LOWER PRIORITY BEFORE
REQUESTING THE PROMOTION TO ACTIVE
*******************************************
02:52:24: SB0:Ethernet0 Hello out 10.0.0.1 Standby pri 105 hel 3 hol 10 ip 10.0.
0.3
02:52:27: SB0:Ethernet0 Hello out 10.0.0.1 Standby pri 105 hel 3 hol 10 ip 10.0.
0.3
***************************************************
**********ADVERTISEMENT AS LOWER PRIORITY**********
***************************************************
02:52:27: SB0:Ethernet0 Hello in 10.0.0.2 Active pri 100 hel 3 hol 10 ip 10.0.0.
3
**********************************************************
**********PROMOTION BY SIDE WITH HIGHER PRIORITY**********
**********************************************************
02:52:27: SB0:Ethernet0 Coup out 10.0.0.1 Standby pri 105 hel 3 hol 10 ip 10.0.0
.3
02:52:27: %STANDBY-6-STATECHANGE: Standby: 0: Ethernet0 state Standby -> Acti
ve
02:52:27: SB0:Ethernet0 Hello out 10.0.0.1 Active pri 105 hel 3 hol 10 ip 10.0.0
.3
02:52:27: SB0: Ethernet0 changing MAC address to 0000.0c07.ac00
02:52:27: SB0:Ethernet0 Resign in 10.0.0.2 Speak pri 100 hel 3 hol 10 ip 10.0.0.
3
02:52:27: SB0:Ethernet0 Hello in 10.0.0.2 Speak pri 100 hel 3 hol 10 ip 10.0.0.3
02:52:29: SB0:Ethernet0 Hello out 10.0.0.1 Active pri 105 hel 3 hol 10 ip 10.0.0
.3
02:52:29: SB0:Ethernet0 Hello in 10.0.0.2 Speak pri 100 hel 3 hol 10 ip 10.0.0.3
02:52:32: SB0:Ethernet0 Hello in 10.0.0.2 Speak pri 100 hel 3 hol 10 ip 10.0.0.3
02:52:32: SB0:Ethernet0 Hello out 10.0.0.1 Active pri 105 hel 3 hol 10 ip 10.0.0
.3u all
All possible debugging has been turned off
R1#
02:52:35: SB0:Ethernet0 Hello in 10.0.0.2 Speak pri 100 hel 3 hol 10 ip 10.0.0.3
02:52:35: SB0:Ethernet0 Hello out 10.0.0.1 Active pri 105 hel 3 hol 10 ip 10.0.0
.3
HTH,
Ken
-----Original Message-----
From: sam_pilot@hotmail.com [mailto:sam_pilot@hotmail.com]
Sent: Mon 10/6/2003 5:58 PM
To: ccielab@groupstudy.com
Cc:
Subject: HSRP question
Can someone clarify how HSRP works when I am tracking a serial interface.
Specifically if a tracked serial interface goes down, does HSRP wait for the
next hello packet with its lowered priority to go out (based on the hello
timer)?
Or does it do send out the hello packet immediately?
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