Not able to PING Multicast IP address

[nabeelcse07]

Hi,

I am working on a scenario, where I have 5 IP cameras connected to Cisco 3750X. I am able to ping the IP address of the Camera but I am not able to Ping the Multicast IP address of the Camera.

I have configured an SVI on the Switch, under which I have given following commands:

ip igmp snooping query-interval 20

ip pim dense-mode

can anyone help in finding a solution this issue?

Regards,

NA

[STEPAN JANKOVIC]

Hello,

Your testing procedure is not correct. It is not usual that multicast source (camera) can reply to ping sent to target multicast group. In some circumstances, multicast receivers can respond to ping to mc group.

If your multicast traffic doesn't flow, please make sure you have at least IP services feature set on your switch and you have enabled multicast routing (ip multicast-routing) as it is not turned on by default.

Anyway - have look at configuration guide for multicast on your platform, for example:

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_53_se/configuration/guide/3750xscg/swmcast.html#wp1284737

For troubleshooting multicast traffic flow, I like this command:

"sh ip mroute (mc group) (mc source) count"

taken from document:

http://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/13726-57.html

Hope this helps

Stepan

[nabeelcse07]

Hi Stepan,

Thank you for your kind response.

When I enter the command "Sh IP mroute count" it shows the following:

Switch#sh ip mroute count
IP Multicast Statistics
9 routes using 5868 bytes of memory
9 groups, 0.00 average sources per group
Forwarding Counts: Pkt Count/Pkts(neg(-) = Drops) per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)

Group: 239.255.255.250, Source count: 0, Packets forwarded: 0, Packets received: 0

Group: 239.168.100.252, Source count: 0, Packets forwarded: 0, Packets received: 0

Group: 239.239.248.1, Source count: 0, Packets forwarded: 0, Packets received: 0

Group: 239.239.249.1, Source count: 0, Packets forwarded: 0, Packets received: 0

Group: 239.239.246.1, Source count: 0, Packets forwarded: 0, Packets received: 0

Group: 239.239.247.1, Source count: 0, Packets forwarded: 0, Packets received: 0

Group: 239.239.245.1, Source count: 0, Packets forwarded: 0, Packets received: 0

Group: 229.111.112.12, Source count: 0, Packets forwarded: 0, Packets received: 0

Group: 224.0.1.40, Source count: 0, Packets forwarded: 0, Packets received: 0

what is the issue, can you please help.

Regards,

NA

[STEPAN JANKOVIC]

Hello,

from this output you can see that no traffic is flowing for listed multicast groups.

You can also put cameras and receiving server into one common VLAN to evade multicast routing on 3750X during initial troubleshooting.

If you are not sure, whether your cameras actually send multicast traffic, you can check it by camera data traffic capture (for example by using span + wireshark).

Anyway you have to know your camera/server solution and have basic understanding how multicast traffic and multicast routing works. You can then use configuration guide already provided and troubleshooting guide already provided.

Regards

Stepan

[paul driver]

Hello
Do you have ip igmp snooping enabled, if so and applicable disable this it and see if you are able to then ping the MC source

Depending on the topology of you network , Enabling pim on the L3 switch routed interfaces should be enough for the directly connected switches to see the IGMP querys/reports and ip igmp snooping querier applied on the extended LAN switches should be enough for them to register their host interest also.

sh ip mroute
sh ip pim interface count < this will tell you on each device if MC is being sent/received

res
Paul