Junos
Highlighted
Junos

How does vMX join a multicast group ?

2 weeks ago

On cisco, I use the following to join a multicast group

interface Ethernet0/0

 ip address 10.10.2.22 255.255.255.0

 ip igmp join-group 239.1.1.10

 

The equivalent on juniper is the following ?

set protocols igmp interface ae0.20 static group 239.2.2.10

Seems not .

Appreciate coaching !!

 

 

 

7 REPLIES 7
Highlighted
Junos

Re: How does vMX join a multicast group ?

2 weeks ago

Hi Gongyayu,

 

Can you run the following commands on  LHR  to verify if the LHR has received the Multicast stream from the source address S, for the Multicast group G:

root@LHR> show multicast route group <group address>
root@LHR> show multicast route extensive group <group address>

 

 

If this solves your problem, please mark this post as "Accepted Solution" so we can help others too

 

Kudos are appreciated too 

 

Regards,

Nadeem

 

Highlighted
Junos

Re: How does vMX join a multicast group ?

2 weeks ago

thanks for taking a look.

Actually I did not use the MX as multicast router, I use it to simulate a multicast receiver.

I need this MX to join a multicast group, so the source can send multicast traffic to it.

I can use a cisco to achieve this.

Highlighted
Junos

Re: How does vMX join a multicast group ?

2 weeks ago

I do see the following

root@LS-A# run show igmp group
Interface: ae0.20, Groups: 4
Group: 239.1.1.10
Source: 0.0.0.0
Last reported by: Local
Timeout: 0 Type: Dynamic
Group: 239.1.1.11
Source: 0.0.0.0
Last reported by: Local
Timeout: 0 Type: Dynamic
Group: 239.2.2.10
Source: 0.0.0.0
Last reported by: Local
Timeout: 0 Type: Static
Group: 239.2.2.11
Source: 0.0.0.0
Last reported by: Local
Timeout: 0 Type: Static
Interface: local, Groups: 2
Group: 224.0.0.2
Source: 0.0.0.0
Last reported by: Local
Timeout: 0 Type: Dynamic
Group: 224.0.0.22
Source: 0.0.0.0
Last reported by: Local
Timeout: 0 Type: Dynamic

 

Highlighted
Junos

Re: How does vMX join a multicast group ?

2 weeks ago

HI gongyayu,

 

You can create IGMP static group membership to test multicast forwarding without a receiver host. When you enable IGMP static group membership, data is forwarded to an interface without that interface receiving membership reports from downstream hosts. The router on which you enable static IGMP group membership must be the designated router (DR) for the subnet; otherwise, traffic does not flow downstream

 

NOTE

When you configure static IGMP group entries on point-to-point links that connect routing devices to a rendezvous point (RP), the static IGMP group entries do not generate join messages toward the RP.

 

user@host> show igmp group
content_copyzoom_out_map
Interface: fe-0/1/2
     Group: 233.252.0.1
         Source: 10.0.0.2
         Last reported by: Local
         Timeout: 0 Type: Static
     Group: 233.252.0.1
         Source: 10.0.0.3
         Last reported by: Local
         Timeout: 0 Type: Static
     Group: 233.252.0.1
         Source: 10.0.0.4
         Last reported by: Local
         Timeout: 0 Type: Static

 

https://www.juniper.net/documentation/en_US/junos/topics/topic-map/mcast-igmp.html#id-enabling-igmp-...

 

 

 

Please mark "Accept as solution" if this answers your query.

Best Regards,

Mohamed

 

 

Highlighted
Junos

Re: How does vMX join a multicast group ?

[ Edited ]
2 weeks ago

Hello,

 

JUNOS has 2 methods to join multicast groups:

1/ if You want vMX to send PIM join upstream, use 

 

 

set protocols igmp interface ae0.20 static group 239.2.2.10

 

2/ if You want vMX to send IGMPv2 join upstream, use

 

 

set logical-systems BLAH protocols sap listen 239.2.2.10

 

- You have to create LS BLAH and add interfaces etc into it first.

- last time I tested, SAP does not work in master LS/inet.0 but works in custom LS. I did not have time t'shoot it back then :slightly_smiling_face: 

 

HTH

Thx

Alex

_____________________________________________________________________

Please ask Your Juniper account team about Juniper Professional Services offerings.
Juniper PS can design, test & build the network/part of the network as per Your requirements

+++++++++++++++++++++++++++++++++++++++++++++

Accept as Solution = cool !
Accept as Solution+Kudo = You are a Star !
Highlighted
Junos

Re: How does vMX join a multicast group ?

[ Edited ]
2 weeks ago

thanks !

It is ODD, the logical system has to be named BLAH.

Highlighted
Junos

Re: How does vMX join a multicast group ?

2 weeks ago

thanks!

The documentation seems to say it should send igmp if I read it correctly, but it does not send igmp report.

Feedback