From: Roger RPF (rpf@bluemail.ch)
Date: Sat Jan 03 2009 - 12:20:25 ARST
Hi Group,
Somehow I do not understand if and why we have to configure the ip sla
responder. On the doccd
http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/hsoverv.
html#wp1063767
it says that configuring the responder is not necessary for all cisco sla
operations.
If I go further and check the chapter using udp echo
http://www.cisco.com/en/US/docs/ios/12_4/ip_sla/configuration/guide/hsudpe.h
tml
it mentions to configure the responder but also with a note that it is not
necessary.
For which reason do we need the responder? I configured the setup with and
without responder, both seem to work but checking the trace I see that with
configured responder, a hash is inserted.
Can someone explain this more detailed? What is this control message the
doccd mentions between sender and responder?
many thanks in advance
Roger
--------
Below the config and the trace outputs:
-<R7-sender>---<R6>---
R7:
ip sla monitor 10
type udpEcho dest-ipaddr 200.0.0.6 dest-port 5000 source-ipaddr 200.0.0.7
frequency 10
ip sla monitor schedule 10 life forever start-time now
R6: (optional responder)
ip sla monitor responder
Debug on R7 without responder:
Jan 3 15:13:24.459: IP SLA Monitor(10) CtrlMsg: Timeout
Jan 3 15:13:24.459: IP SLA Monitor(10) CtrlMsg: No connection
Jan 3 15:13:24.459: IP SLA Monitor(10) Scheduler: Updating result
Jan 3 15:13:29.447: IP SLA Monitor(10) Scheduler: Starting an operation
Jan 3 15:13:29.447: IP SLA Monitor(10) CtrlMsg: Sending msg, ver=1, id=101,
len=52, cmd=2, ip=200.0.0.6, port=5000, duration=5000ms
Debug on R7 with responder:
Jan 3 15:14:49.454: IP SLA Monitor(10) CtrlMsg: Receive status = 0
Jan 3 15:14:49.458: IP SLA Monitor hash insert : 200.0.0.7 50441
Jan 3 15:14:49.458: IP SLA Monitor(10) udpEcho Operation: Sending udp
packet
Jan 3 15:14:49.458: IP SLA Monitor(10) udpEcho Operation: RTT=1
Jan 3 15:14:49.458: IP SLA Monitor hash remove: 200.0.0.7 50441
Jan 3 15:14:49.462: IP SLA Monitor(10) Scheduler: Updating result
Jan 3 15:14:59.451: IP SLA Monitor(10) Scheduler: Starting an operation
Jan 3 15:14:59.451: IP SLA Monitor(10) CtrlMsg: Sending msg, ver=1, id=114,
len=52, cmd=2, ip=200.0.0.6, port=5000, duration=5000ms
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