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PIM SM doesn‘t work

Latest reply: Mar 19, 2015 09:07:48 5562 7 0 0 0

Hi team!

I configured PIM SM based on the topology on eNSP:

PIM SM doesn‘t work-1305133-1

Static RP has been configured on all routers.

Receivers send IGMP reports to AR2 and AR3, (*, G) entry is created:

<AR3>dis pim rout
 VPN-Instance: public net
 Total 1 (*, G) entry; 0 (S, G) entry

 (*, 225.0.0.1)
     RP: 1.1.1.1
     Protocol: pim-sm, Flag: WC
     UpTime: 00:00:35
     Upstream interface: GigabitEthernet0/0/1
         Upstream neighbor: 150.0.1.1
         RPF prime neighbor: 150.0.1.1
     Downstream interface(s) information:
     Total number of downstreams: 1
         1: GigabitEthernet2/0/0
             Protocol: igmp, UpTime: 00:00:35, Expires: -

It looks like RP doesn't create an (S, G) entry. Debuggin PIM and catching packets I can see that multicast traffic is only transmitted to AR1 router. This configuration is simple. That's why my question if PIM SM is supported by eNSP? If yes where the problem can be?


sysname AR1
#
multicast routing-enable
#
interface GigabitEthernet0/0/0
 ip address 150.0.0.1 255.255.255.252
 pim sm
#
interface GigabitEthernet0/0/1
 ip address 150.0.1.1 255.255.255.252
 pim sm
#
interface GigabitEthernet2/0/0
 ip address 10.10.10.1 255.255.255.0
 pim sm
#
interface LoopBack0
 ip address 1.1.1.1 255.255.255.255
#
ospf 1
 area 0.0.0.0
  network 1.1.1.1 0.0.0.0
  network 10.10.10.0 0.0.0.255
  network 150.0.0.0 0.0.0.3
  network 150.0.1.0 0.0.0.3
#
pim
 static-rp 1.1.1.1
#


 sysname AR2
#
multicast routing-enable
#
interface GigabitEthernet0/0/0
 ip address 150.0.0.2 255.255.255.252
 pim sm
#
interface GigabitEthernet0/0/1
 ip address 150.0.2.1 255.255.255.252
 pim sm
#
interface GigabitEthernet2/0/0
 ip address 10.10.50.1 255.255.255.0
 pim sm
 igmp enable
#
ospf 1
 area 0.0.0.0
  network 10.10.50.0 0.0.0.255
  network 150.0.0.0 0.0.0.3
  network 150.0.2.0 0.0.0.3
#
pim
 static-rp 1.1.1.1
#


 sysname AR3
#
multicast routing-enable
#
interface GigabitEthernet0/0/0
 ip address 150.0.2.2 255.255.255.252
 pim sm
#
interface GigabitEthernet0/0/1
 ip address 150.0.1.2 255.255.255.252
 pim sm
#
interface GigabitEthernet2/0/0
 ip address 10.10.70.1 255.255.255.0
 pim sm
 igmp enable
#
ospf 1
 area 0.0.0.0
  network 10.10.70.0 0.0.0.255
  network 150.0.1.0 0.0.0.3
  network 150.0.2.0 0.0.0.3
#
pim
 static-rp 1.1.1.1
#


Thanks!

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Sentinel
Created Jul 10, 2014 12:53:31

Hi M79747,

 

I tested your scenario as shown above and got exactly the same problem, however when I ran Wireshark to check, I found that the Multicast server was not sending anything. It may also be an issue with VLC but I have not looked into this any further.

So the issue seems to be with the multicast sender rather than the routers. I have never used it before so I don't know if I was doing something wrong or maybe it is firewall-related?

I have a simple tool called "UDPMulticastTest.exe" which I have used before so I ran this from my PC. I created a cloud and used a VLAN interface on my PC and connected instead of the multicast server. I then generated some multicast traffic and immediately got an (S, G) entry in my table:

<AR1>disp pim rout
 VPN-Instance: public net
 Total 0 (*, G) entry; 2 (S, G) entries

 (10.10.10.100, 234.56.78.90)
     RP: 1.1.1.1 (local)
     Protocol: pim-sm, Flag: SPT 2MSDP LOC ACT
     UpTime: 00:00:08
     Upstream interface: GigabitEthernet0/0/2
         Upstream neighbor: NULL
         RPF prime neighbor: NULL
     Downstream interface(s) information: None

Hope to help you!

 

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M79747
Created Jul 10, 2014 13:14:35

I was catching packets between multicast source and AR1 by wireshark and the traffic existed. I did lab with PIM DM last time on eNSP and was not any problem with multicast source and VLC.

Packet catched on AR1 GE2/0/0 below. It looks like RP is not able to create (S,G) entry:

I did the same with dynamic RP and results are the same. (S,G) entry is not created. Any idea what is going on? Debugging PIM on AR1 shows only (*,G) entry is created and RPT is also created.

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M79747
Created Jul 10, 2014 13:54:28

Hi again,

I configured PIM SM on S5300 on eNSP and here is the result:

[SwitchA-pim]dis pim routing-table
 VPN-Instance: public net
 Total 0 (*, G) entry; 1 (S, G) entry

 (10.10.10.100, 225.1.1.1)
     RP: 150.1.1.1
     Protocol: pim-sm, Flag: ACT
     UpTime: 00:00:22
     Upstream interface: Vlanif300
         Upstream neighbor: 150.1.1.1
         RPF prime neighbor: 150.1.1.1
     Downstream interface(s) information: None

It works correctly on S5300, so it looks there is a problem with AR routers. Request to eNSP designers to check this behaviour.

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Sentinel
Created Jul 11, 2014 07:57:03

Hi,

 

I am not sure what to say as it works fine for me (apart from the issue with VLC). As soon as I have a source running on Gi0/0/2 of AR1 the S,G entry appears in the table as I showed above in my example.

 

Are you running the latest version od eNSP, what model routers are you using, I used AR2200?

 

Regards Nigel

 

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M79747
Created Jul 11, 2014 08:02:04

I am using AR1220. Maybe I will try to use AR2220 and check the results. Thanks for your reply.
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M79747
Created Jul 11, 2014 08:43:06

Change to AR220 didn't help. There is till the same problem. So it looks like you said that this is a cooperation problem between multicast source and AR router.
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kwaoo
Created Mar 19, 2015 09:07:48

Check your TTL (Time to Live) header from source multicast. TTL 1 = no routing

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