11-26-2019 06:53 AM
Hi, I have a cisco 3650 switch where 3 devices are connected to its tengig ports. All 3 ports are in same vlan and are recieving same multicats. PIM-SM is configured on this vlan.
my problem is when I disconnect one device then other 2 devices loses the multicast and as soon as i reconnect the device rest other two reconnects the mutlicasts. What could be the issue? A quick advice will be helpfull. #3650 #PIM-SM #routing #multicast
11-26-2019 07:22 AM
Hello,
try and turn off IGMP snooping (it should be enabled by default)...
11-26-2019 07:29 AM
11-26-2019 07:38 AM
Hello,
yes. I just want to see if it works when IGMP snooping is disabled. In theory, traffic would be flooded to all ports then.
1. enable
2. configure terminal
3. no ip igmp snooping vlan vlan-id
11-26-2019 08:55 AM - edited 11-26-2019 08:56 AM
Hello
@PranavShekhar12762 wrote:
Hi, I have a cisco 3650 switch where 3 devices are connected to its tengig ports. All 3 ports are in same vlan and are recieving same multicats. PIM-SM is configured on this vlan.
my problem is when I disconnect one device then other 2 devices loses the multicast and as soon as i reconnect the device rest other two reconnects the mutlicasts. What could be the issue? A quick advice will be helpfull. #3650 #PIM-SM #routing #multicast
Make sure those ports are set for spanning-tree portfast otherwise when you reset an access-port without this feature active all non stp edge ports will be temporally disabled until stp reconverges, same goes for trunk edge ports
11-26-2019 11:26 PM
11-27-2019 12:14 AM
Hello,
out of curiosity: did you disable IGMP snooping on the Vlan, and if so, did that make a difference ?
Also, what are the end devices/multicast receivers oon the access ports, are these just regular PCs ?
11-27-2019 01:47 AM
11-27-2019 02:15 AM
Hello,
what brand/type/model are these decoders, and can they be configured ?
11-27-2019 11:34 PM - edited 11-27-2019 11:49 PM
One thing I observed today, No issues when I administratively shut down any tengig port.
So the issue only happens when the SFP is disconnected (removed) from either side or device is switched off. Any clue?
These are professional receivers and decoders, capable to receive Multicast. What kind of configuration you expect, we can configure multicast, UDP Port & source IP and thats all.
11-28-2019 01:46 AM
Hello,
--> These are professional receivers and decoders, capable to receive Multicast
What brand/model are these receivers/decoders ?
11-27-2019 02:43 AM
Hello,
Please clarify the topology:
1. Where is source of multicast traffic located? In the same VLAN, or it's in another VLAN/subnet?
2. Does this switch do only L2 multicast (switching), or L3 multicast (routing) as well?
3. What group IP address is used?
4. What IGMP version is used?
Collect following outputs. First time, when everything is working, and second time when multicast is not delivered to some decoders. Maybe not all the commands will be available, depends on version
on switch, where decoders are connected:
-show ip igmp snooping vlan <>
-show ip igmp snooping groups vlan <>
-show mac address-table multicast
-show ip igmp snooping mrouter vlan <>
-show ip igmp snooping querier vlan <>
On L3 gateway of this VLAN:
-show ip igmp interface
-show ip igmp groups
-show ip mroute
11-27-2019 11:42 PM
11-28-2019 01:41 AM
Were these outputs collected when flow was broken or not?
"show ip igmp interface" - Was this output collected from affected switch? Why there is no Vlan521 in the list? Do you have PIM enabled on Vlan521?
11-28-2019 02:39 AM - edited 11-28-2019 02:42 AM
yes its is there, sorry i ran Sh ip igmp int gig1/0/1
here is the output when run sh ip igmp interface
sh ip igmp interface
GigabitEthernet1/0/1 is up, line protocol is up
Internet address is 10.1.1.6/30
IGMP is enabled on interface
Current IGMP host version is 2
Current IGMP router version is 2
IGMP query interval is 60 seconds
IGMP configured query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP configured querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query count is 2
Last member query response interval is 1000 ms
Inbound IGMP access group is not set
IGMP activity: 0 joins, 0 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 10.1.1.5
IGMP querying router is 10.1.1.5
No multicast groups joined by this system
GigabitEthernet1/0/3 is up, line protocol is up
Internet address is 10.1.1.14/30
IGMP is enabled on interface
Current IGMP host version is 2
Current IGMP router version is 2
IGMP query interval is 60 seconds
IGMP configured query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP configured querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query count is 2
Last member query response interval is 1000 ms
Inbound IGMP access group is not set
IGMP activity: 0 joins, 0 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 10.1.1.13
IGMP querying router is 10.1.1.13
No multicast groups joined by this system
GigabitEthernet1/0/5 is up, line protocol is up
Internet address is 10.1.1.22/30
IGMP is enabled on interface
Current IGMP host version is 2
Current IGMP router version is 2
IGMP query interval is 60 seconds
IGMP configured query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP configured querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query count is 2
Last member query response interval is 1000 ms
Inbound IGMP access group is not set
IGMP activity: 0 joins, 0 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 10.1.1.21
IGMP querying router is 10.1.1.21
No multicast groups joined by this system
GigabitEthernet1/0/7 is up, line protocol is up
Internet address is 10.1.1.30/30
IGMP is enabled on interface
Current IGMP host version is 2
Current IGMP router version is 2
IGMP query interval is 60 seconds
IGMP configured query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP configured querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query count is 2
Last member query response interval is 1000 ms
Inbound IGMP access group is not set
IGMP activity: 0 joins, 0 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 10.1.1.29
IGMP querying router is 10.1.1.29
No multicast groups joined by this system
GigabitEthernet1/0/9 is up, line protocol is up
Internet address is 10.1.1.38/30
IGMP is enabled on interface
Current IGMP host version is 2
Current IGMP router version is 2
IGMP query interval is 60 seconds
IGMP configured query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP configured querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query count is 2
Last member query response interval is 1000 ms
Inbound IGMP access group is not set
IGMP activity: 0 joins, 0 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 10.1.1.37
IGMP querying router is 10.1.1.37
No multicast groups joined by this system
GigabitEthernet1/0/11 is up, line protocol is up
Internet address is 10.1.1.46/30
IGMP is enabled on interface
Current IGMP host version is 2
Current IGMP router version is 2
IGMP query interval is 60 seconds
IGMP configured query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP configured querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query count is 2
Last member query response interval is 1000 ms
Inbound IGMP access group is not set
IGMP activity: 0 joins, 0 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 10.1.1.45
IGMP querying router is 10.1.1.45
No multicast groups joined by this system
Vlan521 is up, line protocol is up
Internet address is 10.0.52.254/24
IGMP is enabled on interface
Current IGMP host version is 2
Current IGMP router version is 2
IGMP query interval is 60 seconds
IGMP configured query interval is 60 seconds
IGMP querier timeout is 120 seconds
IGMP configured querier timeout is 120 seconds
IGMP max query response time is 10 seconds
Last member query count is 2
Last member query response interval is 1000 ms
Inbound IGMP access group is not set
IGMP activity: 731 joins, 687 leaves
Multicast routing is enabled on interface
Multicast TTL threshold is 0
Multicast designated router (DR) is 10.0.52.254 (this system)
IGMP querying router is 10.0.52.254 (this system)
Multicast groups joined by this system (number of users):
224.0.1.40(1)
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