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Webcast-Catalyst9k
New Member

Need help with ip multicast routing setup


We've got a client who needs to set up multicast routing between two sites (and between two vlans) in order for some video encoders at remote sites to find servers at the central site. I've never had experience with this. The setup looks something like:

encoders -> Cisco 4506 -> (CSME) -> Cisco 4510 -> Cisco 8540 -> Cisco 3560 -> servers

The Cisco 4506 is the default gateway for the remote site vlan, let's call it vlan 22.
The Cisco 4510 is the default gateway for the central site vlan, let's call it vlan 33

Also factoring into this, a previous (before my time here) set up of ip multicasting in sparse mode was done using other remote sites using 3640 routers with the 8540 as the RP. I don't know what it was intended for, or if it was ever successfully configured, but I'm not sure it's in use any more.

Here's what's been done so far... the Cisco 4506 now has:

ip multicast-routing
ip pim rp-address 10.99.99.1   [the address of the 8540]
interface Vlan22
   ip pim sparse-dense-mode  [the video encoder vendor recomended this]
[there's also a ip helper-address pointing to a local server for dhcp]

The 4510 has:

ip multicast-routing
ip pim rp-address 10.99.99.1
interface Vlan33
   ip pim sparse-dense-mode

Observations:
- non-multicast traffic seems to be OK
- the encoders never see the servers
- "show ip pim neighbor" shows no results (just headers)
- "show ip multi int vlan33" on the central site shows a large and growing number of multicast in packets, but zero out packets. Same results for vlan22 on the remote site.

Could the problem be igmp packets not getting exchanged? Like I said, I've never set up ip multicast routing before.

Thanks!

3 REPLIES
VIP Super Bronze

Re: Need help with ip multicast routing setup

The Cisco 4506 is the default gateway for the remote site vlan, let's call it vlan 22.
The Cisco 4510 is the default gateway for the central site vlan, let's call it vlan 33

Do you have "ip multicast-routing distributed" enabled on both 4506 and 4510 switches?

I am assuming the connection between the 4506 and 4510 is a /30 routed link, is that correct?

If yes, by enabling "ip pim sparse-dense-mode" on both sides on the /30 your pim neighbor should come up and look some thing like this:

This is from a 3560 but it should look the same on the 4506 ad 4510.

Switch-1#sh ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
      P - Proxy Capable, S - State Refresh Capable
Neighbor          Interface                Uptime/Expires    Ver   DR
Address                                                            Prio/Mode
10.1.1.2          GigabitEthernet2/0/2     00:00:39/00:01:35 v2    1 / DR S P
Switch-1#

Reza

New Member

Re: Need help with ip multicast routing setup

Thanks for your help... I think I'm pretty close to getting this working. I have found out that the encoders in question are not connected directly to the 4506 at the remote site, but go to a 2960-48TC-L first. I'm trying to find an IOS that supports multicast routing (I've already had to upgrade the 3560 that the servers connect to), but I'm having trouble. Does the 2960 support multicast routing?

VIP Super Bronze

Re: Need help with ip multicast routing setup

Yes, it does

2960 is a layer-2 device

From the datasheet:

RFC 1112 - IP Multicast and IGMP

Here is the datasheet:

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps6406/product_data_sheet0900aecd80322c0c.html

HTH

Reza

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