Questions tagged [multicast]

For questions about multicast communications and protocols.

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2answers
600 views

Unidirectional untagged VLAN into another untagged VLAN

I was asked to review a network architecture at work. As I am not very familiar with VLAN utilization with multicast, that is why I am here to request your help. The old network consists of many ...
4
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1answer
4k views

Is it possible to have same multicast group members listening on different port numbers?

Let's say I have a multicast group 239.0.0.1. If A and B are members of this group and listening on port 6000, I can send data to (239.0.0.1, 6000) and both A and B will receive. Now, if A is ...
7
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1answer
1k views

MLD messages during IPv6 duplicate address detection

I was wondering if anyone can shed some light on when Multicast Listener Discovery (MLD) messages ought to be send during IPv6 Duplicate Address Detection. RFC4862 section 5.4.2 gives a detailed ...
5
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1answer
6k views

Why we can not ping to multicast address 224.0.0.9 of RIP

We know that RIP v2 uses multicast address 224.0.0.9 for periodic broadcast of routing table. So it means that every router configured with RIP V2 is monitoring for any packet with destination address ...
12
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0answers
614 views

PIM-SM with BSR over SSG5 VPN tunnel

I've created a lab to troubleshoot an issue I'm having with PIM-SM and BSR. There are two sites connected via two Juniper SSG5s (6.3.0r17) with just enough configuration to focus on the problem at ...
1
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1answer
432 views

Is it possible to use group multicast (IGMP) over the internet?

I am looking at building an application that broadcasts audio using my own proprietary protocol. Under the covers I'd prefer to use IGMP or something where 1000 clients don't use 1000 times the ...
4
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1answer
14k views

RIP V2 multicasting looks as broadcasting at IP add 224.0.0.9

In RIPv1 the packets are broadcasted out all ports with dest. IP 255.255.255.255. In v2 they are multicasted with dest. IP 224.0.0.9. In Packet Tracer, this v2 packet is transmitted over all ...
4
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1answer
916 views

Cisco C891F-K9 ISR latency?

What is the multicast routing latency of Cisco C891F-K9 ISR? Please cite references for your answer. I think it's store-forward type and isn't one of the fastest models (given its price!). I've ...
6
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2answers
2k views

IPv6 Multicast - Purposes for the Interface-Local scope?

On an IPv6 multicast packet, the last nibble of the first hextet represents the Scope of the packet. This defines effectively how far you want your multicast packet to travel. The address makeup is ...
2
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0answers
271 views

Don't receive multicast traffic [closed]

I'm using multicast communications with IGMP snooping enable in the switch, I have 6 nodes (A, B, C, D, E, F), 3 sends data to different Multicast address and 3 receive data from every multicast ...
2
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1answer
126 views

Query router for list of multicast sources [closed]

Is it possible to query a router to return a list multicast sources it has registered, via a protocol? For example, I want to know what multicast sources are available on a router but I don't have ...
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2answers
162 views

Should the Multicast source in an ASM network be a member of the Multicast group?

What happens if traffic is sent to a multicast group from a host which is not a member of that multicast group ? Does the router keep any information for a valid Multicast source and discard this ...
5
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3answers
663 views

Multicast Distribution with PIM

I have to receive some multicast groups for an IPTV platform. I can't use PIM (they don't give me an RP address for the groups...). The provider suggested me to do a join to each multicast group and ...
6
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2answers
2k views

How do I mcast multiple pcap files simultaneously with guaranteed ordering and controllable speed?

We capture many pcap files every day on many different multicast groups. For the purposes of testing & benchmarking, we wish to replay these files in an isolated environment and in a controlled ...
9
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2answers
5k views

why TTL value 1 in IGMP

why TTL value 1 in IGMP protocol and what are the different values possible in TTL section for Multicasting. What I got from the google is that if TTL value is 1 then it won't leave the LAN, but if ...
3
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1answer
603 views

PIM : How does a client discover multicast streams

I have a doubt about multicast. Topology diagram Multicast SEVER -- R1 -- R2 -- R3 -- PC1 From Above diagram , suppose PIM-SM is enabled on all the Routers and let us assume that R2 will be the RP. ...
2
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1answer
469 views

Multicast update on wifi network

I hope my question is fine for this group, and if not, I'll remove it as soon as required. Hereis a shot description of our problem: Our system has many clients (about 500) that should be updated via ...
1
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4answers
4k views

List over assigned global Ethernet MAC multicast address

Where are global Ethernet multicast MAC addresses assigned? Is this by Organizationally Unique Identifier (OUI), and if so, is there a homepage that shows all the assigned global Ethernet MAC ...
6
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3answers
6k views

Wake on LAN across VLANs in IPv6 network

In IPv4, if I want to send a magic packet to a workstation in another VLAN, I enable directed broadcasts in the remote VLAN and send it to the VLAN's broadcast address. This works great. In IPv6, I ...
3
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1answer
1k views

Private vLAN useful to isolate multicast sources?

On a Cisco 3750G switch I have a number (30-ish) of video processors in a vLAN providing multicast streams to clients via a router. Because all of the machines are in the same vLAN they see each ...
2
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1answer
662 views

Is it possible to set up (geographic) anycast on the Internet?

The top level DNS-servers use geographic anycast. Is it possible to set up geographic anycast on your own (DNS) servers on the Internet? The top level DNS-servers use geographic anycast. Is this set ...
2
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1answer
137 views

PIM mode for low latency video [closed]

What is the best PIM mode for a campus video network? There are several relevant factors: All video is local to the campus. Click to view needs to be fast as possible (Life safety issues) Sources are ...
1
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1answer
390 views

Multicast and HSRP

Does an HSRP VIP factor into the PIM designated router and IGMP querier election on a segment? Should they be located on the same interface or device? What would be the effects of having them separate?...
3
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1answer
1k views

Can we do destination port filtering in IGMP V2 or V3?

Is it possible to get a traffic from a multicast address with specific destination port using IGMP? For example, I have some multicast flows like 239.192.7.1:5000, 239.192.7.1:5001 to 239.192.7.1:5009....
10
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3answers
6k views

Setting up PIM Sparse mode

I am working on trying to setup our network for multicast traffic. In the coming months we will be installing new equipment that sends out multicast traffic. In the past we have only had 1 VLAN so we ...
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1answer
1k views

Can a Bridge forward frames with the destination as broadcast/multicast

I have a question regarding multicast and broadcast frames on a network bridge. Will the bridge forward these frames from one network segment to another network segment ?
7
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1answer
8k views

Mitigating a IPv6 malformed packet multicast flood

So we just had our first IPv6 multicast flood in the network this morning. We managed to stop the offending computer by blocking the mac address with: mac-address-table static x.x.x vlan x drop ...
10
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2answers
4k views

KEMP load balancers using UCARP (VRRP) - multicast MAC address not being picked up

Alright - been battling this for at least 20 hours consecutive.. Sorry if this seems like a long rant, or a blog post, but I'm getting to the point of exhaustion. So, here's the deal. We're using ...
3
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1answer
964 views

Any ideas why Cisco 3560G switch isn't passing broadcasted Ethernet packets?

I have a 24 port Cisco 3560G switch that I'm using to try and pass broadcasted Ethernet packets. I have a computer plugged into one port, and a IEC-61850 GOOSE publisher plugged into another port. ...
4
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3answers
548 views

IPv6 Multicast vs Unicast

I'm currently learning IPv6 and they mentioned broadcast is gone in IPv6 and replaced with multicast and unicast. Are there some situations where multicast or unicast is better over the other in ...
0
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1answer
180 views

Igmp snooping based multicast forwarding

In Igmp snooping switch receives an Igmp leave report? Is it possible to change the timeout value in Igmp snooping switch?
5
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1answer
974 views

IGMP snooping in iptv

Host1 wants to join Multicast group as IGMPv3 include (G,S). The same group and source Host2 send as Exclude(G,S) report. what process done in switch?
4
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2answers
534 views

IGMP snooping (Bridge operation)

What is Meant by RFC 4541 when it says... 4) All non-IPv4 multicast packets should continue to be flooded out to all remaining ports in the forwarding state as per normal IEEE bridging operations.
8
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2answers
6k views

IGMP snooping and link-local multicast addresses

I have a network which has many devices sending data to 224.0.0.225 on a VLAN which spans multiple switches. Each device (aprox 12 of them) is sending reporting data at roughly 500-600 kbps. Each port ...
9
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1answer
5k views

switchport block multicast vs storm-control multicast

I'm not sure what is the difference in behaviour between switchport block multicast and storm-control multicast and I don't think cisco elaborates the difference very well in their documentation, ...
4
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2answers
1k views

Alternatives to GRE for multicast over MPLS?

I have an application that requires multicast across our MPLS WAN, and had been using GRE tunnels to facilitate this until recently when I replaced some aging edge routers with HP L3 switches. To my ...
8
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1answer
990 views

Which address should I use to receive a UDP wireless multicast with iperf?

On computer 1 (192.168.1.3): I made a route to be sure that my communication pass through my wireless card sudo route add -net 239.0.0.0 netmask 255.255.255.0 dev wlan2 I launch iperf with the ...
8
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2answers
3k views

Which address should I choose to send a multicast message on an wireles ad-hoc meshed network?

I am trying to implement a wireless multicast ad-hoc network, but I don't know how it works. I think I have to send my packets to a specific 224.0.0.* address, but I don't which one choose. My ...
10
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4answers
5k views

PIM-SM multicast and HSRP/VRRP

I need to set up a PC to listen in on a multicast (PIM-SM) data feed. The multicast sources and (anycast) Rendezvous point are behind a "HSRP/VRRP address" on the other side of a WAN link. (The ...
11
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3answers
4k views

OSPF over vPC on Nexus7k

I'm trying to help a friend with some Nexus issues. The topology is like this: Cat 3750 stack -> vPC -> 2x N7k -> LACP -> Fortigate firewall cluster The 3750 stack is running OSPF to both the ...

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