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multicast with compress

Hi,

I am wondering whether there is any known issue about multicast with compression. We have recently conducted experimental implementation of simple "ip pim dense-mode" with "compress stac" and observed intermittent loss of packets in between a multicast server and its clients. The bandwidth utilization is quite low (5% under compress and 10% under non-compress). If we remove "compress stac" statement from the config, multicast works fine and if we do a unicast transmission with "compress stac" it also works fine. However, packets drop under multicast with compress configuration. Here is our config (exerpt):

============================================

server (3620):

(config)#ip multicast-routing

(config)#int fa 0/0

(config-if)#ip address 10.10.10.2 255.255.255.0

(config-if)#ip pim dense-mode

(config)#int s 0/0

(config-if)#ip address 10.11.92.1 255.255.255.0

(config-if)#ip pim dense-mode

(config-if)#encap ppp

(config-if)#compress stac

(config)#int s 0/1

(config-if)#ip address 10.11.93.1 255.255.255.0

(config-if)#ip pim dense-mode

(config-if)#encap ppp

(config-if)#compress stac

client (1720):

(config)#ip multicast-routing

(config)#int fa 0

(config-if)#ip address 10.10.1.254 255.255.255.0

(config-if)#ip helper-address 10.10.10.1

(config-if)#ip pim dense-mode

(config)#int s 0

(config-if)#ip address 10.11.92.2 255.255.255.0

(config-if)#ip pim dense-mode

============================================

Multicast packets are sent from the server-fa0/0 (10.10.10.11) to clients (225.2.128.1/2/3..etc.), and 10 out of 450 packets are lost (we monitored them by hooking sniffers on server and client segments.

I would appreciate if you shed light on this issue.

thanks,

1 REPLY

Re: multicast with compress

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center (http://www.cisco.com/tac) or speak with a TAC engineer. You can open a TAC case online at http://www.cisco.com/tac/caseopen

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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