Multicast Over Vlans - Not Working

[abdelkader amghar]

Hello All,

I've multicast issue, when i use different vlan.

The group adress is 239.192.1.1

On 3850 :

I've enable IP PIM sparse mode enable on INT VLAN 7 ET VLAN 3

RP adresse10.1.8.254

On SG500 L2 :

Ip igmp snooping only enable

here is the config on the 3850 and some multicast command in order to debug:

CORE#sh ip int brief

Interface              IP-Address      OK? Method Status                Protocol

Vlan1                  unassigned      YES NVRAM  up                    up

Vlan2                  10.1.1.254      YES NVRAM  up                    up

Vlan3                  10.1.2.254      YES NVRAM  up                    up

Vlan4                  10.1.5.254      YES NVRAM  up                    up

Vlan5                  10.1.6.254      YES NVRAM  up                    up

Vlan6                  10.1.7.254      YES NVRAM  up                    up

Vlan7                  10.1.8.254      YES NVRAM  up                    up

Vlan8                  10.1.9.254      YES NVRAM  up                    up

Vlan9                  10.1.10.254     YES NVRAM  up                    up

Vlan10                 10.1.11.254     YES NVRAM  up                    up

GigabitEthernet0/0     unassigned      YES unset  down                  down

GigabitEthernet1/0/1   unassigned      YES unset  down                  down

GigabitEthernet1/0/2   unassigned      YES unset  administratively down down

GigabitEthernet1/0/3   unassigned      YES unset  administratively down down

GigabitEthernet1/0/4   unassigned      YES unset  administratively down down

GigabitEthernet1/0/5   unassigned      YES unset  administratively down down

GigabitEthernet1/0/6   unassigned      YES unset  administratively down down

GigabitEthernet1/0/7   unassigned      YES unset  administratively down down

GigabitEthernet1/0/8   unassigned      YES unset  administratively down down

GigabitEthernet1/0/9   unassigned      YES unset  administratively down down

GigabitEthernet1/0/10  unassigned      YES unset  up                    up

Te1/1/1                10.92.255.22    YES NVRAM  up                    up

Te1/1/2                unassigned      YES unset  up                    up

Te1/1/3                unassigned      YES unset  up                    up

Te1/1/4                unassigned      YES unset  administratively down down

Tunnel0                10.1.8.254      YES unset  up                    up

Tunnel1                10.1.8.254      YES unset  up                    up

CORE#sh ip route

Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2

       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2

       ia - IS-IS inter area, * - candidate default, U - per-user static route

       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP

       + - replicated route, % - next hop override

Gateway of last resort is 10.92.255.21 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 10.92.255.21

      10.0.0.0/8 is variably subnetted, 20 subnets, 4 masks

C        10.1.1.0/24 is directly connected, Vlan2

L        10.1.1.254/32 is directly connected, Vlan2

C        10.1.2.0/24 is directly connected, Vlan3

L        10.1.2.254/32 is directly connected, Vlan3

C        10.1.4.0/23 is directly connected, Vlan4

L        10.1.5.254/32 is directly connected, Vlan4

C        10.1.6.0/24 is directly connected, Vlan5

L        10.1.6.254/32 is directly connected, Vlan5

C        10.1.7.0/24 is directly connected, Vlan6

L        10.1.7.254/32 is directly connected, Vlan6

C        10.1.8.0/24 is directly connected, Vlan7

L        10.1.8.254/32 is directly connected, Vlan7

C        10.1.9.0/24 is directly connected, Vlan8

L        10.1.9.254/32 is directly connected, Vlan8

C        10.1.10.0/24 is directly connected, Vlan9

L        10.1.10.254/32 is directly connected, Vlan9

C        10.1.11.0/24 is directly connected, Vlan10

L        10.1.11.254/32 is directly connected, Vlan10

C        10.92.255.20/30 is directly connected, TenGigabitEthernet1/1/1

L        10.92.255.22/32 is directly connected, TenGigabitEthernet1/1/1

CORE#sh int vlan 7

Vlan7 is up, line protocol is up

  Hardware is Ethernet SVI, address is cc5a.5383.1067 (bia cc5a.5383.1067)

  Internet address is 10.1.8.254/24

  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 7/255

  Encapsulation ARPA, loopback not set

  Keepalive not supported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output never, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/20/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 30277000 bits/sec, 2789 packets/sec

  5 minute output rate 28000 bits/sec, 1 packets/sec

     370430248 packets input, 503272111747 bytes, 0 no buffer

     Received 0 broadcasts (10 IP multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     416819 packets output, 95619968 bytes, 0 underruns

     0 output errors, 2 interface resets

     0 unknown protocol drops

     0 output buffer failures, 0 output buffers swapped out

CORE#sh int vlan 3

Vlan3 is up, line protocol is up

  Hardware is Ethernet SVI, address is cc5a.5383.1067 (bia cc5a.5383.1067)

  Internet address is 10.1.2.254/24

  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation ARPA, loopback not set

  Keepalive not supported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:03, output never, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 57000 bits/sec, 4 packets/sec

     3435540 packets input, 1945286581 bytes, 0 no buffer

     Received 0 broadcasts (3 IP multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     4778213 packets output, 6015209728 bytes, 0 underruns

     0 output errors, 2 interface resets

     0 unknown protocol drops

     0 output buffer failures, 0 output buffers swapped out

CORE#

CORE#

CORE#

CORE#sh ip pim rp

Group: 239.192.1.1, RP: 10.1.8.254, next RP-reachable never

Group: 239.255.255.255, RP: 10.1.8.254, next RP-reachable never

Group: 239.255.255.254, RP: 10.1.8.254, next RP-reachable never

Group: 239.255.255.250, RP: 10.1.8.254, next RP-reachable never

Group: 239.192.0.1, RP: 10.1.8.254, next RP-reachable never

Group: 224.0.1.40, RP: 10.1.8.254, next RP-reachable never

CORE#

CORE#

CORE#sh int trunk

Port        Mode             Encapsulation  Status        Native vlan

Gi1/0/47    on               802.1q         trunking      1

Gi1/0/48    on               802.1q         trunking      999

Te1/1/2     on               802.1q         trunking      999

Te1/1/3     on               802.1q         trunking      999

Port        Vlans allowed on trunk

Gi1/0/47    1-10,30,999

Gi1/0/48    1-10,30,999

Te1/1/2     1-10,30,999

Te1/1/3     1-10,30,999

Port        Vlans allowed and active in management domain

Gi1/0/47    1-10,30,999

Gi1/0/48    1-10,30,999

Te1/1/2     1-10,30,999

Te1/1/3     1-10,30,999

Port        Vlans in spanning tree forwarding state and not pruned

Gi1/0/47    1-10,30,999

Gi1/0/48    1-10,30,999

Te1/1/2     1-10,30,999

Te1/1/3     1-10,30,999

CORE#

CORE#

CORE#sh ip mroute

IP Multicast Routing Table

Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,

       L - Local, P - Pruned, R - RP-bit set, F - Register flag,

       T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,

       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,

       U - URD, I - Received Source Specific Host Report,

       Z - Multicast Tunnel, z - MDT-data group sender,

       Y - Joined MDT-data group, y - Sending to MDT-data group,

       G - Received BGP C-Mroute, g - Sent BGP C-Mroute,

       N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed,

       Q - Received BGP S-A Route, q - Sent BGP S-A Route,

       V - RD & Vector, v - Vector, p - PIM Joins on route,

       x - VxLAN group

Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join

 Timers: Uptime/Expires

 Interface state: Interface, Next-Hop or VCD, State/Mode

239.192.1.1), 13:49:06/00:02:29, RP 10.1.8.254, flags: SJCL

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Sparse, 01:36:32/00:02:29

    Vlan7, Forward/Sparse, 13:20:02/00:02:08

(*, 239.255.255.255), 1d08h/stopped, RP 10.1.8.254, flags: SJC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Sparse, 01:59:29/00:02:30

    Vlan7, Forward/Sparse, 1d07h/00:02:10

(10.1.2.100, 239.255.255.255), 01:59:02/00:01:09, flags: T

  Incoming interface: Vlan3, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan7, Forward/Sparse, 01:59:02/00:02:10

(10.1.8.1, 239.255.255.255), 1d07h/00:02:45, flags: T

  Incoming interface: Vlan7, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Sparse, 01:59:29/00:02:30

(10.1.8.100, 239.255.255.255), 1d07h/00:01:06, flags: JT

  Incoming interface: Vlan7, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Sparse, 01:59:29/00:02:30

(*, 239.255.255.254), 01:59:30/00:02:35, RP 10.1.8.254, flags: SJC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Sparse, 01:59:29/00:02:35

(*, 239.255.255.250), 1d08h/00:02:52, RP 10.1.8.254, flags: SJC

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Sparse, 01:59:29/00:02:33

    Vlan6, Forward/Sparse, 1d08h/00:02:52

(*, 239.192.0.1), 01:59:27/00:02:36, RP 10.1.8.254, flags: SJCL

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Sparse, 01:59:27/00:02:36

(*, 224.0.1.40), 1d08h/00:02:51, RP 10.1.8.254, flags: SJCL

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan6, Forward/Sparse, 1d08h/00:02:51

CORE#sh ip igmp membership

Flags: A  - aggregate, T - tracked

       L  - Local, S - static, V - virtual, R - Reported through v3

       I - v3lite, U - Urd, M - SSM (S,G) channel

       1,2,3 - The version of IGMP, the group is in

Channel/Group-Flags:

       / - Filtering entry (Exclude mode (S,G), Include mode (G))

Reporter:

       <mac-or-ip-address> - last reporter if group is not explicitly tracked

       <n>/<m>      - <n> reporter in include mode, <m> reporter in exclude

 Channel/Group                  Reporter        Uptime   Exp.  Flags  Interface

 *,239.192.1.1                  10.1.2.254      01:37:06 02:56 2LA    Vl3

 *,239.192.1.1                  10.1.8.100      13:20:36 02:39 2A     Vl7

 *,239.255.255.255              10.1.2.11       02:00:04 02:56 2A     Vl3

 *,239.255.255.255              10.1.8.100      1d07h    02:33 2A     Vl7

 *,239.255.255.254              10.1.2.20       02:00:04 02:56 2A     Vl3

 *,239.255.255.250              10.1.2.100      02:00:04 02:59 2A     Vl3

 *,239.255.255.250              10.1.7.2        1d08h    02:18 2A     Vl6

 *,239.192.0.1                  10.1.2.254      02:00:01 02:03 2LA    Vl3

 *,224.0.1.40                   10.1.7.254      1d08h    02:17 2LA    Vl6

I noticed that in the sh ip mroute i've (*,G) and not  (S,G):

(*, 239.192.1.1), 13:49:06/00:02:29, RP 10.1.8.254, flags: SJCL

  Incoming interface: Null, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Sparse, 01:36:32/00:02:29

    Vlan7, Forward/Sparse, 13:20:02/00:02:08

BUT NOT 

( IP player, 239.192.1.1) 13:49:06/00:02:29, RP 10.1.8.254, flags: SJCL

  Incoming interface: VLAN 7, RPF nbr 0.0.0.0

  Outgoing interface list:

    Vlan3, Forward/Sparse, 01:36:32/00:02:29

    Vlan7, Forward/Sparse, 13:20:02/00:02:08

Thanks for your help.

[abdelkader amghar]

Sorry i've just to read some explanation about RPF and maybe you asked me ip rpf with ip of the player who doesnt works 10.1.2.100.

CORE#sh ip rpf 10.1.2.100
RPF information for ? (10.1.2.100)
  RPF interface: Vlan3
  RPF neighbor: ? (10.1.2.100) - directly connected
  RPF route/mask: 10.1.2.0/24
  RPF type: multicast (connected)
  Doing distance-preferred lookups across tables
  RPF topology: ipv4 multicast base

Here is the same command with the player where the stream is working.

CORE#sh ip rpf 10.1.8.100
RPF information for ? (10.1.8.100)
  RPF interface: Vlan7
  RPF neighbor: ? (10.1.8.100) - directly connected
  RPF route/mask: 10.1.8.0/24
  RPF type: multicast (connected)
  Doing distance-preferred lookups across tables
  RPF topology: ipv4 multicast base

Regards

[abdelkader amghar]

Hello Paul

here is routing table:

CORE#sh ip rout
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 10.92.255.21 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 10.92.255.21
      10.0.0.0/8 is variably subnetted, 20 subnets, 4 masks
C        10.1.1.0/24 is directly connected, Vlan2
L        10.1.1.254/32 is directly connected, Vlan2
C        10.1.2.0/24 is directly connected, Vlan3
L        10.1.2.254/32 is directly connected, Vlan3
C        10.1.4.0/23 is directly connected, Vlan4
L        10.1.5.254/32 is directly connected, Vlan4
C        10.1.6.0/24 is directly connected, Vlan5
L        10.1.6.254/32 is directly connected, Vlan5
C        10.1.7.0/24 is directly connected, Vlan6
L        10.1.7.254/32 is directly connected, Vlan6
C        10.1.8.0/24 is directly connected, Vlan7
L        10.1.8.254/32 is directly connected, Vlan7
C        10.1.9.0/24 is directly connected, Vlan8
L        10.1.9.254/32 is directly connected, Vlan8
C        10.1.10.0/24 is directly connected, Vlan9
L        10.1.10.254/32 is directly connected, Vlan9
C        10.1.11.0/24 is directly connected, Vlan10
L        10.1.11.254/32 is directly connected, Vlan10
C        10.92.255.20/30 is directly connected, TenGigabitEthernet1/1/1
L        10.92.255.22/32 is directly connected, TenGigabitEthernet1/1/1

Sorry i've just to read some explanation about RPF and maybe you asked me ip rpf with ip of the player who doesnt works 10.1.2.100.

CORE#sh ip rpf 10.1.2.100
RPF information for ? (10.1.2.100)
  RPF interface: Vlan3
  RPF neighbor: ? (10.1.2.100) - directly connected
  RPF route/mask: 10.1.2.0/24
  RPF type: multicast (connected)
  Doing distance-preferred lookups across tables
  RPF topology: ipv4 multicast base

Here is the same command with the player where the stream is working.

CORE#sh ip rpf 10.1.8.100
RPF information for ? (10.1.8.100)
  RPF interface: Vlan7
  RPF neighbor: ? (10.1.8.100) - directly connected
  RPF route/mask: 10.1.8.0/24
  RPF type: multicast (connected)
  Doing distance-preferred lookups across tables
  RPF topology: ipv4 multicast base

Regards

[abdelkader amghar]

hello,

Any ideas guys?

Regards,

Abdel

[paul driver]

Hello

To summarize, You have a valid route back to the Mc source from the access switch even though the mroute count state you do have RPF failures?

Have you checked if its not the host thats the problem? - Have you tried swapping the hosts around between vlan3 -7 and tested?

res
Paul

[abdelkader amghar]

Hello Paul,

The issut is not on the player host.

Indeed as is said before when i take the  player who doesnt works and plug it direclty on the core switch on vlan 3 the stream works therefore the player is working.

I've an issue only when i use the access switch whi is trunked with core this is why maybe I've something wrong on the settings in the SG500 switch.

thanks

Abdel

[paul driver]

Hello 

Can you enable the following please on the SG500 switch:

igmp snooping queirer

or

ip igmp snooping vlan 3 mrouter interface ( trunk interface)

res
Paul

[abdelkader amghar]

Hello Paul,

thanks for your help.

Here is the command I've on the switch about IGMP:

SW-EST-1#sh ip igmp snooping
  cpe                  customer premises equipment.
  groups               Group of multicast addresses learned by IGMP snooping
  interface            IGMP snooping interface information
  mrouter              IGMP snooping multicast routers interfaces
  multicast-tv         multicast transmissions from a vlan

SW-EST-1#sh ip igmp snooping interface 3

IGMP Snooping is globally enabled
IGMP Snooping Querier is globally enabled
VLAN 3
  IGMP Snooping is enabled
  IGMP snooping last immediate leave: disable
  Automatic learning of Multicast router ports is enabled
  IGMP Snooping Querier is disabled
  IGMP Snooping Querier operation state: is not running
  IGMP Snooping Querier version: 2
  IGMP Snooping Querier election is enabled
  IGMP Snooping Querier address :
  IGMP snooping robustness: admin 2  oper 2
  IGMP snooping query interval: admin 125 sec oper 125 sec
  IGMP snooping query maximum response: admin 10 sec oper 10 sec
  IGMP snooping last member query counter: admin 2 (default) oper 2
  IGMP snooping last member query interval: admin 1000 msec oper 1000 msec

Groups that are in IGMP version 2 compatibility mode:
Groups that are in IGMP version 1 compatibility mode:

SW-EST-1#sh ip igmp snooping mrouter

Vlan        Dynamic               Static             Forbidden
----- -------------------- -------------------- --------------------
  1
  2
  3         gi1/1/50
  4
  5
  6         gi1/1/50             gi1/1/50
  7         gi1/1/50
  8
  9
 10
 666
 999

SW-EST-1#sh ip igmp snooping interface 7

IGMP Snooping is globally enabled
IGMP Snooping Querier is globally enabled
VLAN 7
  IGMP Snooping is enabled
  IGMP snooping last immediate leave: disable
  Automatic learning of Multicast router ports is enabled
  IGMP Snooping Querier is disabled
  IGMP Snooping Querier operation state: is not running
  IGMP Snooping Querier version: 2
  IGMP Snooping Querier election is enabled
  IGMP Snooping Querier address :
  IGMP snooping robustness: admin 2  oper 2
  IGMP snooping query interval: admin 125 sec oper 125 sec
  IGMP snooping query maximum response: admin 10 sec oper 10 sec
  IGMP snooping last member query counter: admin 2 (default) oper 2
  IGMP snooping last member query interval: admin 1000 msec oper 1000 msec

Groups that are in IGMP version 2 compatibility mode:
Groups that are in IGMP version 1 compatibility mode:

Thks

[paul driver]

Hello

IGMP Snooping Querier is disabled
  IGMP Snooping Querier operation state: is not running
  IGMP Snooping Querier version: 2


so please enable  -

conf t
 ip igmp snooping querier

res
Paul

[abdelkader amghar]

Hi,

Already done last week and it doesnt change anything.

as you have noticed querier is not enable also for vlan 7 and it works.

i've enable it

SW-EST-1(config)#ip igmp snooping vlan 3 querier
SW-EST-1(config)#exi
SW-EST-1#sh ip igmp snooping interface 3

IGMP Snooping is globally enabled
IGMP Snooping Querier is globally enabled
VLAN 3
  IGMP Snooping is enabled
  IGMP snooping last immediate leave: disable
  Automatic learning of Multicast router ports is enabled
  IGMP Snooping Querier is enabled
  IGMP Snooping Querier operation state: is running
  IGMP Snooping Querier version: 2
  IGMP Snooping Querier election is enabled
  IGMP Snooping Querier address :
  IGMP snooping robustness: admin 2  oper 2
  IGMP snooping query interval: admin 125 sec oper 125 sec
  IGMP snooping query maximum response: admin 10 sec oper 10 sec
  IGMP snooping last member query counter: admin 2 (default) oper 2
  IGMP snooping last member query interval: admin 1000 msec oper 1000 msec

Groups that are in IGMP version 2 compatibility mode:
Groups that are in IGMP version 1 compatibility mode:

regards

[abdelkader amghar]

hello Paul,

I'll try to do port mirroring trace in order to have all the information.

If i understand you need a port mirroring from the Server who sent multicast and also from the VLC client on vlan 3 who ask the stream.

DO you need something else?

Regards

[paul driver]

Hello

Lets summarise this:

1. Host in vlan 7 on that switch works but host in vlan 3 doesn't- but both work in their own vlans from core switch?
2. You have enabled snooping - igmp querier or mrouter on the host switch ?
3. Ip routing is disabled on the host switch 
4. mroute count show rpf failures but you say rpf is valid 
5. If you attach a non mc host to a access port in vlan 3 on that host switch it works fine

res

Paul

[paul driver]

Hello

Aplogies I Didn't make myself clear perform this on the switch first closest to the host then the router

sh ip rpf 10.1.8.254 

then follow the next hop of the received mc via the route table it should show a difference regards the rpf failure 

sh ip route 

res

paul

[nsalgado]

If you do a "ping 239.192.1.1 source vlan7 repeat 5" from the Core you get the S,G ?

[nsalgado]

Also please try to enable "ip sap listen" under SVI VL7 in the core.

[abdelkader amghar]

Hello,

Just to remember that i've the issue only on VLAN3 or all other VLAN different of VLAN7.

you are right when I ping from vlan to 239.192.1.1 i can found the (S,G).

Can you confirm that "S"adress should be the SVI of the VLAN and not the IP of the player.

Thks

CORE(config-if)#exit
CORE#

CORE#sh ip sap
SAP Cache - 3 entries
  ChC)rie 25
  HD1
  L'Equipe 21

 
CORE#ping 239.192.1.1 source vlan 7 repeat 5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 239.192.1.1, timeout is 2 seconds:
Packet sent with a source address of 10.1.8.254
.....
CORE#ping 239.192.1.1 source vlan 3 repeat 5
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 239.192.1.1, timeout is 2 seconds:
Packet sent with a source address of 10.1.2.254

Reply to request 0 from 10.1.8.1, 1 ms
Reply to request 0 from 10.1.8.1, 10 ms....

CORE#sh ip mroute
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry, E - Extranet,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report,
       Z - Multicast Tunnel, z - MDT-data group sender,
       Y - Joined MDT-data group, y - Sending to MDT-data group,
       G - Received BGP C-Mroute, g - Sent BGP C-Mroute,
       N - Received BGP Shared-Tree Prune, n - BGP C-Mroute suppressed,
       Q - Received BGP S-A Route, q - Sent BGP S-A Route,
       V - RD & Vector, v - Vector, p - PIM Joins on route,
       x - VxLAN group
Outgoing interface flags: H - Hardware switched, A - Assert winner, p - PIM Join
 Timers: Uptime/Expires
 Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 239.192.1.1), 05:28:28/stopped, RP 10.1.8.254, flags: SJC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan7, Forward/Sparse, 00:14:14/00:02:02
    Vlan3, Forward/Sparse, 05:28:28/00:02:49

(10.1.2.254, 239.192.1.1), 00:00:13/00:02:54, flags: JT
  Incoming interface: Vlan3, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan7, Forward/Sparse, 00:00:13/00:02:46, A

(*, 239.255.255.255), 05:52:09/stopped, RP 10.1.8.254, flags: SJCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan7, Forward/Sparse, 05:51:57/00:02:05
    Vlan3, Forward/Sparse, 05:52:09/00:02:58

(10.1.8.100, 239.255.255.255), 05:50:45/00:02:39, flags: LT
  Incoming interface: Vlan7, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan3, Forward/Sparse, 05:50:45/00:02:58

(10.1.2.100, 239.255.255.255), 05:50:49/00:02:45, flags: LT
  Incoming interface: Vlan3, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan7, Forward/Sparse, 05:50:49/00:02:05

(10.1.8.1, 239.255.255.255), 05:51:10/00:01:38, flags: LT
  Incoming interface: Vlan7, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan3, Forward/Sparse, 05:51:10/00:02:58

(*, 239.255.255.254), 05:52:11/00:02:49, RP 10.1.8.254, flags: SJC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan3, Forward/Sparse, 05:52:09/00:02:49

(*, 239.255.255.250), 05:52:11/00:02:53, RP 10.1.8.254, flags: SJC
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan3, Forward/Sparse, 05:52:09/00:02:53

(*, 224.2.127.254), 00:10:29/00:02:50, RP 10.1.8.254, flags: SJCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan3, Forward/Sparse, 00:10:05/00:02:50
    Vlan7, Forward/Sparse, 00:10:29/00:02:08

(*, 224.0.1.40), 05:52:11/00:02:54, RP 10.1.8.254, flags: SJCL
  Incoming interface: Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan3, Forward/Sparse, 05:52:09/00:02:54