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Multicast Turn on

Dear All,

I would like to ask about multicast.I have one DC and one branch.My branch have 10 vlan and using one router and one switch. I am using VPN and eigrp route to carry traffic to DC.DC have one router one firewall and one switch.All switches are layer 2 switch.no need to configure and it is using for performance. Is it correct? 

 

L2Sw---router-->VPN<---router---firewall---L2switch

 

I would like to know one of my vlan are using for vedio streaming. Do I need to turn on multicast?

In Cisco document said L2 switch carry all multicast traffic are carried by default.

I donot need to configure to carry my eigrp advertising multicast also .

Let me is it different?

I reference below reference link.

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti_igmp/configuration/xe-3se/5700/imc-igmp-xe-3se-5700-book/imc_constr_sw_eth_nw.pdf

 

 

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VIP Advisor

Re: Multicast Turn on

Hello
PIm will run over the top of the dmvpn network by enabling it on the tunnel interfaces as shown it the previous post.

Regards the network performance well extra traffic will utilize the network but I guess you'll need check this against any baselines you may have but using pim sparse mode wouldn't be as resource intensive as pim dense mode which would flood the network for MC receivers, Pim sparse wont to this it will only forward MC traffic after it receives a request to do so.



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
3 REPLIES 3
VIP Advisor

Re: Multicast Turn on

Hello
If the MC stream is due to crossover the vpn then you'll probably need to enable ip multicast and allow pim and mc through your Firewall

One way would to enable ip pim spare mode on your tunnel interfaces on all the routers and the L3 interfaces of your vlans that wish to receive MC traffic.
You could use auto-Rp  for the required RP and have this located on the same rtr of your source mc stream (first hop router)
Lastly and additionally enable ip pim autorp listener to the others devices so to enable RP discovery.

Example:
MC source-L2Sw---router1-->VPN<---router2---firewall---L2switch-MC recipients

L2Sw

ip multicast-routing distributed
ip igmp snooping
ip igmp snooping vlan xx
no ip pim dm-fallback
ip pim autorp listener

int vlan xx
ip pim sparse-mode

router1 (first hop rtr)
ip multicast-routing
no ip pim dm-fallback

int tun xx
ip pim sparse-mode

int xx
description lan facing interface
ip pim sparse-mode
exit

int lo0
description RP address
ip address xxxx
iip pim sparse-mode

 

ip access-list standard MCgroup
permit 224.1.1.0 0.0.0.255

ip pim send-rp-announce lo0 scope 10  group-list MCgroup
ip pim send-rp-discovery lo0 scope10

router 2
ip multicast-routing
no ip pim dm-fallback
ip pim autorp listener

int tun xx
ip pim sparse-mode

int xx
description lan facing interface
ip pim sparse-mode
exit


L2switch
ip multicast-routing distributed
ip igmp snooping
ip igmp snooping vlan xx
no ip pim dm-fallback
ip pim autorp listener

int vlan xx
ip pim sparse-mode



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
Participant

Re: Multicast Turn on

hi ,

Thanks for your explain.Let me know I am using DMVPN phase 3 with EIGRP, do I still to enable multicast ? It will be effect my network performance or any impact? It will be effect to other van?

VIP Advisor

Re: Multicast Turn on

Hello
PIm will run over the top of the dmvpn network by enabling it on the tunnel interfaces as shown it the previous post.

Regards the network performance well extra traffic will utilize the network but I guess you'll need check this against any baselines you may have but using pim sparse mode wouldn't be as resource intensive as pim dense mode which would flood the network for MC receivers, Pim sparse wont to this it will only forward MC traffic after it receives a request to do so.



kind regards
Paul

Please rate and mark posts accordingly if you have found any of the information provided useful.
It will hopefully assist others with similar issues in the future
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