using IPSLA to test IP Multicast - NoConnection/Busy/Timeout
I am trying to use IPSLA to generate a test feed between 2 cisco CE routers (hostnames R15 and R7) which are connected over a Layer 3 VPN MPLS network but i am getting some unexpected results with IPSLA yet with an ICMP ping to the multicast address it works ok.
R15#sh ip int brief Interface IP-Address OK? Method Status Protocol FastEthernet0/0 192.168.15.1 YES NVRAM up up FastEthernet0/1 172.30.30.137 YES NVRAM up up Loopback0 172.30.30.15 YES NVRAM up up
R7#sh ip int brief Interface IP-Address OK? Method Status Protocol FastEthernet0/0 unassigned YES NVRAM administratively down down FastEthernet0/1 192.168.7.7 YES NVRAM up up Serial0/0/0:1 172.30.30.122 YES NVRAM up up Loopback1 172.30.30.7 YES NVRAM up up Loopback7 10.10.7.1 YES manual up up
R7 (test receiver) is configured with "ip igmp join-group 126.96.36.199" under its FastEthernet0/1 interface and also set as "ip sla monitor responder".
R7#sh run | inc igmp|sla ip sla monitor responder ip igmp join-group 188.8.131.52
R15 (test sender) is configured with an IPSLA UDP echo probe sending traffic to multicast address 184.108.40.206 as follows:
R15#sh run | b ip sla ip sla 1 udp-echo 220.127.116.11 65500 source-ip 172.30.30.15 timeout 100 frequency 5 ip sla schedule 1 life forever start-time now
The IPSLA probe is reporting "No connection" and no successes:
R15#sh ip sla statistics 1
Round Trip Time (RTT) for Index 1 Latest RTT: NoConnection/Busy/Timeout Latest operation start time: 15:19:44.332 CET Fri Jul 20 2012 Latest operation return code: No connection Number of successes: 0 Number of failures: 56 Operation time to live: Forever
Yet when testing this with a standard ICMP ping it works ok and the remote router (R7) where the IGMP join is applied responds:
R15#ping 18.104.22.168 source 172.30.30.15
Type escape sequence to abort. Sending 1, 100-byte ICMP Echos to 22.214.171.124, timeout is 2 seconds: Packet sent with a source address of 172.30.30.15
Reply to request 0 from 172.30.30.122, 8 ms Reply to request 0 from 172.30.30.122, 8 ms
So i am trying to figure out why the IPSLA is failing but the ICMP ping fails......?
When applying debug ip packet & mpacket on R15 (test sender) i see the UDP echos being generated to destination address 126.96.36.199 but for some reason i see the destination UDP port as being 1967 and not 65500 as i had configured in my SLA probe:
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