Multicast routing over MPLS

VON CLAWSON · ‎04-22-2010

Topology is as follows.

Informacast server --> 3750-->2811-->MPLS-->2811-->3750-->iphone

I have configured ip pim sparse-dense-mode on all interfaces along this path. One item that may be a problem is that the 3750's have the c3750e-universal-mz.122-50.SE image and it only gives me ip pim passive. Since the multicast is going through this switch from the server I think they may be a problem. but here are some output from the switches and routers. Any help would be greatly appreciated. By the way, the multicast to phones off of the first 3750 switch works.

3750

interface Vlan200
description Server
ip address 192.168.200.254 255.255.255.0
ip pim passive
ip igmp helper-address 172.16.12.9
end

interface Vlan253
description :Transit VLAN to WAN Router
ip address 172.16.253.1 255.255.255.0
ip pim passive
ip igmp helper-address 172.16.12.9
end

ip pim rp-address 172.16.12.1

GMI-LF-3750-Stack#sh ip igmp group
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter   Group Accounted
239.255.255.254 Vlan200                  02:01:53 00:02:54 192.168.200.5
239.255.255.253 Vlan200                  02:01:52 00:02:59 192.168.200.9
239.255.255.250 Vlan200                  02:01:53 00:02:52 192.168.200.48
239.255.255.250 Vlan8                    03:02:30 00:02:59 192.168.80.7
239.255.255.250 Vlan19                   03:28:17 00:02:01 192.168.190.15
239.255.255.250 Vlan13                   03:31:44 00:02:59 192.168.130.2
239.255.255.250 Vlan3                    03:42:28 00:01:59 192.168.30.6
239.255.255.250 Vlan9                    2w1d      00:02:58 192.168.90.1
239.255.255.250 Vlan10                   7w1d      00:02:59 192.168.100.5
239.255.255.250 Vlan5                    8w4d      00:01:58 192.168.50.5
239.255.255.250 Vlan4                    43w4d     00:02:59 192.168.40.7
239.255.255.250 Vlan12                   44w5d     00:02:59 192.168.120.3
239.255.255.250 Vlan14                   44w5d     00:02:58 192.168.140.2
239.255.255.250 Vlan7                    44w5d     00:02:59 192.168.70.3
239.255.255.250 Vlan11                   44w5d     00:02:59 192.168.110.11
239.255.255.250 Vlan16                   44w5d     00:02:59 192.168.160.1
239.255.255.250 Vlan15                   44w5d     00:02:59 192.168.150.4
239.255.255.250 Vlan6                    44w5d     00:02:58 192.168.60.1
224.0.1.24       Vlan200                  02:01:51 00:02:54 192.168.200.17
224.0.1.60       Vlan5                    02:34:10 00:02:05 192.168.50.2
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter   Group Accounted
224.0.1.60       Vlan18                   3w4d      00:01:58 192.168.180.133
224.0.1.60       Vlan14                   44w4d     00:02:53 192.168.140.202
224.0.1.40       Vlan253                  01:57:24 00:02:10 172.16.253.9

GMI-LF-3750-Stack#sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report,
       Z - Multicast Tunnel, z - MDT-data group sender,
       Y - Joined MDT-data group, y - Sending to MDT-data group
       V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 239.255.255.254), 10w4d/00:02:16, RP 172.16.12.1, flags: SJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan200, Forward/Sparse-Dense, 02:02:32/00:02:16

(*, 239.255.255.253), 12w5d/00:02:38, RP 172.16.12.1, flags: SJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan200, Forward/Sparse-Dense, 02:02:32/00:02:21

(*, 239.255.255.250), 44w5d/stopped, RP 172.16.12.1, flags: SJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
    Vlan200, Forward/Sparse-Dense, 02:02:32/00:02:26
    Vlan8, Forward/Sparse-Dense, 03:03:10/00:02:21
    Vlan19, Forward/Sparse-Dense, 03:28:57/00:02:23
    Vlan13, Forward/Sparse-Dense, 03:32:23/00:02:20
    Vlan3, Forward/Sparse-Dense, 03:43:08/00:02:22
    Vlan9, Forward/Sparse-Dense, 2w1d/00:02:20
    Vlan10, Forward/Sparse-Dense, 7w1d/00:02:16
    Vlan5, Forward/Sparse-Dense, 8w4d/00:02:18
    Vlan4, Forward/Sparse-Dense, 43w4d/00:02:16
    Vlan12, Forward/Sparse-Dense, 44w5d/00:02:16
    Vlan14, Forward/Sparse-Dense, 44w5d/00:02:15
    Vlan7, Forward/Sparse-Dense, 44w5d/00:02:16
    Vlan11, Forward/Sparse-Dense, 44w5d/00:02:16
    Vlan16, Forward/Sparse-Dense, 44w5d/00:02:16
    Vlan15, Forward/Sparse-Dense, 44w5d/00:02:16
    Vlan6, Forward/Sparse-Dense, 44w5d/00:02:15

(192.168.200.44, 239.255.255.250), 00:03:06/00:02:27, flags: T
Incoming interface: Vlan200, RPF nbr 0.0.0.0
Outgoing interface list:
    Vlan6, Forward/Sparse-Dense, 00:03:06/00:02:15
    Vlan15, Forward/Sparse-Dense, 00:03:06/00:02:16
    Vlan16, Forward/Sparse-Dense, 00:03:06/00:02:16
    Vlan11, Forward/Sparse-Dense, 00:03:06/00:02:16
    Vlan7, Forward/Sparse-Dense, 00:03:06/00:02:16
    Vlan14, Forward/Sparse-Dense, 00:03:06/00:02:15
    Vlan12, Forward/Sparse-Dense, 00:03:06/00:02:16
    Vlan4, Forward/Sparse-Dense, 00:03:06/00:02:16
    Vlan5, Forward/Sparse-Dense, 00:03:06/00:02:18
    Vlan10, Forward/Sparse-Dense, 00:03:07/00:02:15
    Vlan9, Forward/Sparse-Dense, 00:03:07/00:02:14
    Vlan3, Forward/Sparse-Dense, 00:03:07/00:02:17
    Vlan13, Forward/Sparse-Dense, 00:03:07/00:02:15
    Vlan19, Forward/Sparse-Dense, 00:03:07/00:02:17
    Vlan8, Forward/Sparse-Dense, 00:03:07/00:02:15

(*, 224.0.1.24), 10w4d/00:02:10, RP 172.16.12.1, flags: SJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan200, Forward/Sparse-Dense, 02:02:36/00:02:10

(*, 224.0.1.60), 44w5d/00:02:23, RP 172.16.12.1, flags: SJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
    Vlan5, Forward/Sparse-Dense, 02:34:55/00:02:18
    Vlan18, Forward/Sparse-Dense, 3w4d/00:02:23
    Vlan14, Forward/Sparse-Dense, 44w4d/00:02:15

(*, 224.0.1.40), 00:36:53/00:02:41, RP 172.16.12.1, flags: SJPC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null

(*, 224.0.1.41), 01:48:02/stopped, RP 172.16.12.1, flags: SP
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null

(172.16.12.9, 224.0.1.41), 01:45:26/00:01:38, flags: PT
Incoming interface: Vlan112, RPF nbr 0.0.0.0
Outgoing interface list: Null

(172.16.12.10, 224.0.1.41), 01:46:01/00:02:43, flags: PT
Incoming interface: Vlan112, RPF nbr 0.0.0.0
Outgoing interface list: Null

First 2811

GMILF-2811-VG2#sh ip igmp group
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter   Group Accounted
239.255.255.254 FastEthernet0/0.112      00:49:09 00:02:18 172.16.12.1
239.255.255.253 FastEthernet0/0.112      00:49:04 00:02:19 172.16.12.1
239.255.255.250 FastEthernet0/0.112      00:49:10 00:02:30 172.16.12.1
224.0.1.24       FastEthernet0/0.112      00:49:03 00:02:18 172.16.12.1
224.0.1.40       FastEthernet0/0.112      00:48:37 00:02:47 172.16.12.1
224.0.1.40       FastEthernet0/0.253      01:58:55 00:02:47 172.16.253.9
GMILF-2811-VG2#

GMILF-2811-VG2#sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report,
       Z - Multicast Tunnel, z - MDT-data group sender,
       Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 239.255.255.254), 00:37:29/00:02:54, RP 172.16.12.1, flags: SP
Incoming interface: FastEthernet0/0.112, RPF nbr 172.16.12.1
Outgoing interface list: Null

(*, 239.255.255.253), 00:37:24/00:02:53, RP 172.16.12.1, flags: SP
Incoming interface: FastEthernet0/0.112, RPF nbr 172.16.12.1
Outgoing interface list: Null

(*, 239.255.255.250), 00:37:28/00:02:51, RP 172.16.12.1, flags: SP
Incoming interface: FastEthernet0/0.112, RPF nbr 172.16.12.1
Outgoing interface list: Null

(*, 224.0.1.24), 00:37:21/00:02:58, RP 172.16.12.1, flags: SP
Incoming interface: FastEthernet0/0.112, RPF nbr 172.16.12.1
Outgoing interface list: Null

(*, 224.0.1.40), 00:38:11/00:02:21, RP 172.16.12.1, flags: SJPL
Incoming interface: FastEthernet0/0.112, RPF nbr 172.16.12.1
Outgoing interface list: Null

(*, 224.0.1.41), 00:37:50/stopped, RP 172.16.12.1, flags: SP
Incoming interface: FastEthernet0/0.112, RPF nbr 172.16.12.1
Outgoing interface list: Null

(172.16.12.9, 224.0.1.41), 00:37:32/00:02:31, flags: PT
Incoming interface: FastEthernet0/0.112, RPF nbr 0.0.0.0
Outgoing interface list: Null

(172.16.12.10, 224.0.1.41), 00:37:50/00:02:58, flags: PT
Incoming interface: FastEthernet0/0.112, RPF nbr 0.0.0.0
Outgoing interface list: Null

Second 2811

ELECOR-2811-VG1#sh ip igmp group
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter Group Accounted
224.0.1.40 FastEthernet0/0.112 01:06:05 00:02:30 172.19.12.1
ELECOR-2811-VG1#

ELECOR-2811-VG1#sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report,
       Z - Multicast Tunnel, z - MDT-data group sender,
       Y - Joined MDT-data group, y - Sending to MDT-data group,
       V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.0.1.40), 00:38:36/00:02:12, RP 172.16.12.1, flags: SJCL
Incoming interface: FastEthernet0/1, RPF nbr 10.255.255.5
Outgoing interface list:
FastEthernet0/0.112, Forward/Sparse-Dense, 00:38:36/00:02:12

(*, 224.0.1.41), 00:38:11/stopped, RP 172.16.12.1, flags: SPF
Incoming interface: FastEthernet0/1, RPF nbr 10.255.255.5
Outgoing interface list: Null

(172.19.12.1, 224.0.1.41), 00:38:11/00:02:40, flags: PFT
Incoming interface: FastEthernet0/0.112, RPF nbr 0.0.0.0, Registering
Outgoing interface list: Null

Please rate if this helps.

Giuseppe Larosa · ‎04-22-2010

Hello Vclawson,

some other information is needed, so some questions follows:

a) kind of MPLS service

with MPLS what do you mean?

If you have two sites connected by an MPLS L3 VPN you cannot setup multicast routing without cooperation with ISP unless you setup a point-to-point GRE tunnel between the two C2811

if you have a different type of service like a L2 VPN or simply you have bought a transport service you can go on in this way

b) you are trying to use PIM stub on the C3750 there is at least one interface that is not in passive mode and that connects the C3750 with the C2811.

c) another important point:

even if you are using PIM sparse-dense mode you need to configure a rendezvous-point, then groups served by RP will be treated as sparse and groups not served by RP are treated as dense.

But you still need to configure a RP

see

http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_basic_cfg_ps6441_TSD_Products_Configuration_Guide_Chapter.html#wp1054581

Hope to help

Giuseppe

VON CLAWSON · ‎04-22-2010

Thanks for the response. The ISP has opened up the MPLS for multicast. The 3750 is configured with ip pim passive because the ios image only gives me that option. I can't configure sparse-dense-mode as I have on the other devices. The question there is do I need to put a differen image on there so it is not a stub. I have configured an RP on both the 3750 and the 2811 but neither has worked. So the switchport that connects the 2811 needs to have ip pim passive?

Please rate if this helps.

Giuseppe Larosa · ‎04-22-2010

Hello VcLawson,

but it is an MPLS L3 VPN or not?

if it is, the RP has to be chosen in agreement with the ISP

about C3750:

PIM stub routing moves routed traffic closer to the end user and reduces network traffic. You can also reduce traffic by configuring a stub router (switch) with the IGMP helper feature.

You can configure a stub router (switch) with the igmp helper help-address interface configuration command to enable the switch to send reports to the next-hop interface. Hosts that are not directly connected to a downstream router can then join a multicast group sourced from an upstream network. The IGMP packets from a host wanting to join a multicast stream are forwarded upstream to the next-hop device when this feature is configured. When the upstream central router receives the helper IGMP reports or leaves, it adds or removes the interfaces from its outgoing interface list for that group.

see

http://www.cisco.com/en/US/products/hw/switches/ps5023/products_installation_and_configuration_guides_list.html

>> So the switchport that connects the 2811 needs to have ip pim passive?

the Layer3 interface to router should be configured or for pim (not for passive) if pim is not supported I would not configure igmp helper towards the C2811 but only on client Vlans.

the IGMP helper-address should work for clients that are on Vlans defined on the C3750.

For sure the interface on the C2811 towards the C3750 needs to have pim enabled in order to process relayed IGMP joins and reports (if any)

Hope to help

Giuseppe