Other device loses multicast when one device is disconnected

[PranavShekhar12762]

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

[Georg Pauwen]

Hello,

try and turn off IGMP snooping (it should be enabled by default)...

[PranavShekhar12762]

on the Vlan?

[Georg Pauwen]

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

[paul driver]

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

[PranavShekhar12762]

Hi Paul,
Spanning portfast is enabled on all port


interface TenGigabitEthernet1/1/1
switchport access vlan 521
switchport mode access
spanning-tree portfast
!
interface TenGigabitEthernet1/1/2
switchport access vlan 521
switchport mode access
spanning-tree portfast
!
interface TenGigabitEthernet1/1/3
switchport access vlan 521
switchport mode access
spanning-tree portfast
!

[Georg Pauwen]

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 ?

[PranavShekhar12762]

Hello Pauwen,
No, unfortunately disabling IGMP snooping didn't work.
The end devices are Multicast receivers (Decoders) not regular PCs.

Another finding today, here are the details
Test Scenario 1:
Decoder#1, 10GB port connected to Cisco Tengig1/1/1
Decoder#2, 10GB port connected to Cisco Tengig1/1/2
Decoder#3, 10GB port connected to Cisco Tengig1/1/3

When 10GB disconnected from Decoder#1,
Decoder#2: Loses Multicast
Decoder#3: Loses Multicast
When 10GB disconnected from Decoder#2
Decoder#1: OK
Decoder#3: Loses Multicast
When 10GB disconnected from Decoder#3
Decoder#1: OK
Decoder#2: OK

Test Scenario 2:
Decoder#1, 10GB port connected to Cisco Tengig1/1/3 (Port Swapped with Decoder#3)
Decoder#2, 10GB port connected to Cisco Tengig1/1/2
Decoder#3, 10GB port connected to Cisco Tengig1/1/1 (Port Swapped with Decoder#1)

When 10GB disconnected from Decoder#1,
Decoder#2: OK
Decoder#3: OK
When 10GB disconnected from Decoder#2
Decoder#1: Loses Multicast
Decoder#3: OK
When 10GB disconnected from Decoder#3
Decoder#2: Loses Multicast
Decoder#3: Loses Multicast

[Georg Pauwen]

Hello,

what brand/type/model are these decoders, and can they be configured ?

[PranavShekhar12762]

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.

[Georg Pauwen]

Hello,

--> These are professional receivers and decoders, capable to receive Multicast

What brand/model are these receivers/decoders ?

[vb10]

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

[PranavShekhar12762]

1. Where is source of multicast traffic located? In the same VLAN, or it's in another VLAN/subnet?
Another switch, another subnet.

2. Does this switch do only L2 multicast (switching), or L3 multicast (routing) as well?
L3
3. What group IP address is used?
there are many e.g. 239.1.201.1 to 11
4. What IGMP version is used?
v2


show ip igmp snooping vlan <>
Global IGMP Snooping configuration:
-------------------------------------------
IGMP snooping : Enabled
IGMPv3 snooping (minimal) : Enabled
Report suppression : Enabled
TCN solicit query : Disabled
TCN flood query count : 2
Robustness variable : 2
Last member query count : 2
Last member query interval : 1000

Vlan 521:
--------
IGMP snooping : Enabled
IGMPv2 immediate leave : Disabled
Multicast router learning mode : pim-dvmrp
CGMP interoperability mode : IGMP_ONLY
Robustness variable : 2
Last member query count : 2
Last member query interval : 1000
-show ip igmp snooping groups vlan <>
521 232.0.0.1 igmp v2 Te1/1/2, Te1/1/4
521 239.1.201.3 igmp v2 Te1/1/4
521 239.1.201.5 igmp v2 Te1/1/2
521 239.1.201.6 igmp v2 Te1/1/2
521 239.1.201.7 igmp v2 Te1/1/4
521 239.1.202.3 igmp v2 Te1/1/4
521 239.1.202.6 igmp v2 Te1/1/4
521 239.1.202.7 igmp v2 Te1/1/2
521 239.1.202.10 igmp v2 Te1/1/4
521 239.1.203.1 igmp v2 Te1/1/4
521 239.1.203.2 igmp v2 Te1/1/4
521 239.1.203.3 igmp v2 Te1/1/4
521 239.1.204.1 igmp v2 Te1/1/4
521 239.1.204.2 igmp v2 Te1/1/4
521 239.1.204.3 igmp v2 Te1/1/4
521 239.1.204.4 igmp v2 Te1/1/4
521 239.1.204.5 igmp v2 Te1/1/4
521 239.1.204.6 igmp v2 Te1/1/4
521 239.1.204.7 igmp v2 Te1/1/4
521 239.1.204.9 igmp v2 Te1/1/4
521 239.1.204.10 igmp v2 Te1/1/4
521 239.1.205.1 igmp v2 Te1/1/2
521 239.1.205.2 igmp v2 Te1/1/2
521 239.1.205.3 igmp v2 Te1/1/2
521 239.1.205.4 igmp v2 Te1/1/2
521 239.1.205.5 igmp v2 Te1/1/2
521 239.1.205.6 igmp v2 Te1/1/2
521 239.1.205.7 igmp v2 Te1/1/2
521 239.1.205.8 igmp v2 Te1/1/2
521 239.1.206.1 igmp v2 Te1/1/2
521 239.1.206.2 igmp v2 Te1/1/2, Te1/1/4
521 239.1.206.3 igmp v2 Gi1/0/13, Te1/1/2, Te1/1/4
521 239.1.206.4 igmp v2 Te1/1/2
521 239.1.206.5 igmp v2 Te1/1/2
521 239.100.12.1 igmp v2 Gi2/0/2
521 239.100.12.2 igmp v2 Gi2/0/3, Gi2/0/4
521 239.100.12.3 igmp v2 Gi2/0/5, Gi2/0/6
521 239.100.12.4 igmp v2 Gi2/0/7, Gi2/0/8
521 239.100.12.5 igmp v2 Gi2/0/9, Gi2/0/10
521 239.100.12.6 igmp v2 Gi2/0/11, Gi2/0/12
521 239.100.12.7 igmp v2 Gi2/0/13
521 239.100.12.8 igmp v2 Gi2/0/15, Gi2/0/16
521 239.100.12.9 igmp v2 Gi2/0/17, Gi2/0/18

-show mac address-table multicast
No output on this command
-show ip igmp snooping mrouter vlan <>
Vlan ports
---- -----
521 Router
-show ip igmp snooping querier vlan <>
IP address : 10.0.52.254
IGMP version : v2
Port : Router
Max response time : 10s

On L3 gateway of this VLAN:
show 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
-show ip igmp groups
239.1.201.3 Vlan521 17:44:31 00:02:41 10.0.51.15
239.1.201.5 Vlan521 00:10:53 00:02:37 10.0.51.11
239.1.201.7 Vlan521 17:44:31 00:02:40 10.0.51.15
239.1.201.6 Vlan521 00:10:53 00:02:32 10.0.51.11
-show ip mroute
All multicasts shows the sources IP e.g.
(*, 239.1.204.7), 17:45:01/stopped, RP 1.1.1.4, flags: SJC
Incoming interface: GigabitEthernet1/0/7, RPF nbr 10.1.1.29
Outgoing interface list:
Vlan521, Forward/Sparse, 17:45:01/00:02:11

(10.0.14.117, 239.1.204.7), 17:45:01/00:01:24, flags: JT
Incoming interface: GigabitEthernet1/0/7, RPF nbr 10.1.1.29
Outgoing interface list:
Vlan521, Forward/Sparse, 17:45:01/00:02:11

[vb10]

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?

[PranavShekhar12762]

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)