Multicast Lab Auto-RP

ftermine83 · ‎04-10-2024

Hi ALL,

I have setup a lab in CML for testing multicast using Auto-RP but I cant see traffic flowing from the source to the receivers . I can see the (S,G) entry in the first hop router and the (*,G) entry in the RP .

Appreciate any feedback

Thanks,

Francesco

ftermine83 · ‎04-10-2024

The source is directly connected to R1 and RP is router R3

R1# show ip mroute

(*, 224.3.3.3), 00:00:07/stopped, RP 3.3.3.3, flags: SPF
Incoming interface: GigabitEthernet0/0, RPF nbr 172.16.12.2
Outgoing interface list: Null

(172.16.1.2, 224.3.3.3), 00:00:07/00:02:52, flags: PFT
Incoming interface: GigabitEthernet0/1, RPF nbr 0.0.0.0, Registering
Outgoing interface list: Null

R3# show ip mroute

(*, 224.3.3.3), 00:19:19/00:02:55, RP 3.3.3.3, flags: S
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
GigabitEthernet0/1, Forward/Sparse, 00:19:19/00:02:55

MHM Cisco World · ‎04-10-2024

Outgoing interface list: Null

This meaning ypu dont config multicast in each interface' can you double check config PIM under interface?

MHM

ftermine83 · ‎04-11-2024

PIM seems enabled on all interfaces from FHR to RP . please find below

R1#show ip pim interface

Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
1.1.1.1 Loopback0 v2/S 0 30 1 1.1.1.1
172.16.12.1 GigabitEthernet0/0 v2/S 1 30 1 172.16.12.2
172.16.1.1 GigabitEthernet0/1 v2/S 0 30 1 172.16.1.1

R1#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID Local Intrfce Holdtme Capability Platform Port ID
R2 Gig 0/0 168 R B Gig 0/0

-----------------------------------------------------------------------------
R2#show ip pim interface

Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
2.2.2.2 Loopback0 v2/S 0 30 1 2.2.2.2
172.16.12.2 GigabitEthernet0/0 v2/S 1 30 1 172.16.12.2
172.16.23.2 GigabitEthernet0/1 v2/S 1 30 1 172.16.23.3
172.16.24.2 GigabitEthernet0/2 v2/S 1 30 1 172.16.24.4
172.16.2.2 GigabitEthernet0/3 v2/S 0 30 1 172.16.2.2

R2#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID Local Intrfce Holdtme Capability Platform Port ID
R3 Gig 0/1 173 R B Gig 0/0
R1 Gig 0/0 129 R B Gig 0/0
R4 Gig 0/2 171 R B Gig 0/0

---------------------------------------------------------------------------------------
R3#show ip pim interface

Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
3.3.3.3 Loopback0 v2/S 0 30 1 3.3.3.3
172.16.23.3 GigabitEthernet0/0 v2/S 1 30 1 172.16.23.3
172.16.35.3 GigabitEthernet0/1 v2/S 1 30 1 172.16.35.5
172.16.34.3 GigabitEthernet0/2 v2/S 1 30 1 172.16.34.4

R3#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID Local Intrfce Holdtme Capability Platform Port ID
R2 Gig 0/0 164 R B Gig 0/1
R4 Gig 0/2 166 R B Gig 0/3
R5 Gig 0/1 135 R B Gig 0/1

MHM Cisco World · ‎04-11-2024

Share

show ip pim rp mapping

And config of RP (R3) and R1'R2

MHM

ftermine83 · ‎04-12-2024

R1#show ip pim rp mapping
PIM Group-to-RP Mappings

Group(s) 224.0.0.0/4
RP 3.3.3.3 (?), v2v1
Info source: 3.3.3.3 (?), elected via Auto-RP
Uptime: 23:55:06, expires: 00:00:23

R2#show ip pim rp mapping
PIM Group-to-RP Mappings

Group(s) 224.0.0.0/4
RP 3.3.3.3 (?), v2v1
Info source: 3.3.3.3 (?), elected via Auto-RP
Uptime: 1d23h, expires: 00:00:29

R3#show ip pim rp mapping
PIM Group-to-RP Mappings
This system is an RP (Auto-RP)
This system is an RP-mapping agent (Loopback0)

Group(s) 224.0.0.0/4
RP 3.3.3.3 (?), v2v1
Info source: 3.3.3.3 (?), elected via Auto-RP
Uptime: 1d23h, expires: 00:00:24

Torbjørn · ‎04-12-2024

The RP discovery seems to be working as intended. Both your unicast and multicast routing config looks to be fine.

What is your source? Does it send with a default TTL of 1(VLC does this by default)?

Happy to help! Please mark as helpful/solution if applicable.
Get in touch: https://torbjorn.dev

ftermine83 · ‎04-12-2024

source is 172.16.1.2 . I am using iperf to generate the traffic and I did a packet capture and TTL is 15. I also check RPF in the RP and it matches routing

Using this command with Alpine in CML:

iperf -c 224.3.3.3 -u -i 5 -t 60 --ttl 15

ftermine83 · ‎04-12-2024

MHM Cisco World · ‎04-12-2024

172.16.1.2, 224.3.3.3), 00:00:07/00:02:52, flags: PFT
Incoming interface: GigabitEthernet0/1, RPF nbr 0.0.0.0, Registering
Outgoing interface list: Null <-many

And with mpls ip

So let try below

1- remove mpls ip form all interface

If issue solved

Then

2- return mpls ip

In RP

Under loopback use

Ip ospf network type p2p

And

Mpls ldp router-id loopback 0 force

Note:- I think you need to close open lab to make mpls re exchange the label correctly

Then check multicast again.

Note:- there are two multicast source for troubleshooting remove one

MHM

MHM Cisco World · ‎04-12-2024

Update me about this case after modify config regarding mpls

MHM

ftermine83 · ‎04-18-2024

sorry for the late response , I have been away .

I have removed mpls from all the interfaces but no luck .

there is only one multicast source in this lab which is connected to R1

ftermine83 · ‎04-18-2024

there is only one multicast source in this lab which is connected to R1

MHM Cisco World · ‎04-18-2024

In last weekend' I do read more about cases make multicast failed' so this time I hope I can solve your issue

Share this for R3' R1' R2

Show ip pim neighbor

Show ip igmp group

Show ip mroute <muticast IP>

Show ip mroute <multicast IP> count

MHM

ftermine83 · ‎04-18-2024

R3#show ip mroute count
Use "show ip mfib count" to get better response time for a large number of mroutes.

IP Multicast Statistics
4 routes using 3720 bytes of memory
2 groups, 1.00 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)

Group: 224.0.1.39, Source count: 1, Packets forwarded: 0, Packets received: 0
Source: 3.3.3.3/32, Forwarding: 0/0/0/0, Other: 0/0/0

Group: 224.0.1.40, Source count: 1, Packets forwarded: 0, Packets received: 0
Source: 3.3.3.3/32, Forwarding: 0/0/0/0, Other: 0/0/0

R3#show 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

(*, 224.0.1.39), 01:20:55/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Loopback0, Forward/Sparse, 01:20:55/stopped
GigabitEthernet0/2, Forward/Sparse, 01:20:55/stopped
GigabitEthernet0/1, Forward/Sparse, 01:20:55/stopped
GigabitEthernet0/0, Forward/Sparse, 01:20:55/stopped

(3.3.3.3, 224.0.1.39), 01:20:54/00:02:55, flags: LT
Incoming interface: Loopback0, RPF nbr 0.0.0.0
Outgoing interface list:
GigabitEthernet0/0, Forward/Sparse, 01:20:54/stopped
GigabitEthernet0/1, Forward/Sparse, 01:20:54/stopped
GigabitEthernet0/2, Forward/Sparse, 01:20:54/stopped

(*, 224.0.1.40), 01:20:54/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Loopback0, Forward/Sparse, 01:20:54/stopped
GigabitEthernet0/1, Forward/Sparse, 01:20:54/stopped
GigabitEthernet0/0, Forward/Sparse, 01:20:54/stopped
GigabitEthernet0/2, Forward/Sparse, 01:20:54/stopped

(3.3.3.3, 224.0.1.40), 01:20:54/00:02:53, flags: LT
Incoming interface: Loopback0, RPF nbr 0.0.0.0
Outgoing interface list:
GigabitEthernet0/2, Forward/Sparse, 01:20:54/stopped
GigabitEthernet0/0, Forward/Sparse, 01:20:54/stopped
GigabitEthernet0/1, Forward/Sparse, 01:20:54/stopped

R3#show ip igmp groups
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter Group Accounted
224.0.1.39 GigabitEthernet0/2 01:21:05 00:02:02 172.16.34.3
224.0.1.39 GigabitEthernet0/1 01:21:05 00:02:04 172.16.35.3
224.0.1.39 GigabitEthernet0/0 01:21:05 00:02:53 172.16.23.3
224.0.1.39 Loopback0 01:21:05 00:02:02 3.3.3.3
224.0.1.40 Loopback0 01:21:04 00:02:58 3.3.3.3

R3#show ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
P - Proxy Capable, S - State Refresh Capable, G - GenID Capable,
L - DR Load-balancing Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
172.16.23.2 GigabitEthernet0/0 01:21:11/00:01:42 v2 1 / S P G
172.16.35.5 GigabitEthernet0/1 01:18:24/00:01:37 v2 1 / DR S P G
172.16.34.4 GigabitEthernet0/2 01:21:11/00:01:40 v2 1 / DR S P G

------------------------------------------------------------------------

R2#show ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
P - Proxy Capable, S - State Refresh Capable, G - GenID Capable,
L - DR Load-balancing Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
172.16.12.1 GigabitEthernet0/0 01:23:57/00:01:26 v2 1 / S P G
172.16.23.3 GigabitEthernet0/1 01:22:47/00:01:35 v2 1 / DR S P G
172.16.24.4 GigabitEthernet0/2 01:23:57/00:01:23 v2 1 / DR S P G

R2#show ip igmp groups
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter Group Accounted
224.0.1.39 GigabitEthernet0/1 01:24:14 00:02:47 172.16.23.3
224.0.1.40 Loopback0 01:24:16 00:02:44 2.2.2.2

R2#show ip mroute count
Use "show ip mfib count" to get better response time for a large number of mroutes.

IP Multicast Statistics
4 routes using 3516 bytes of memory
2 groups, 1.00 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)

Group: 224.0.1.39, Source count: 1, Packets forwarded: 27, Packets received: 523
Source: 3.3.3.3/32, Forwarding: 27/0/48/0, Other: 523/24/472

Group: 224.0.1.40, Source count: 1, Packets forwarded: 486, Packets received: 489
Source: 3.3.3.3/32, Forwarding: 486/0/48/0, Other: 489/3/0

R2#show 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

(*, 224.0.1.39), 01:24:30/stopped, RP 0.0.0.0, flags: DC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
GigabitEthernet0/2, Forward/Sparse, 01:24:30/stopped
GigabitEthernet0/1, Forward/Sparse, 01:24:30/stopped
GigabitEthernet0/0, Forward/Sparse, 01:24:30/stopped

(3.3.3.3, 224.0.1.39), 01:24:30/00:01:06, flags: PT
Incoming interface: GigabitEthernet0/1, RPF nbr 172.16.23.3
Outgoing interface list:
GigabitEthernet0/2, Prune/Sparse, 01:01:03/00:00:54
GigabitEthernet0/0, Prune/Sparse, 00:02:31/00:00:28

(*, 224.0.1.40), 01:24:30/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Loopback0, Forward/Sparse, 01:24:30/stopped
GigabitEthernet0/2, Forward/Sparse, 01:24:30/stopped
GigabitEthernet0/1, Forward/Sparse, 01:24:30/stopped
GigabitEthernet0/0, Forward/Sparse, 01:24:30/stopped

(3.3.3.3, 224.0.1.40), 01:24:21/00:02:50, flags: LT
Incoming interface: GigabitEthernet0/1, RPF nbr 172.16.23.3
Outgoing interface list:
Loopback0, Forward/Sparse, 01:24:21/stopped
GigabitEthernet0/0, Forward/Sparse, 01:24:21/stopped
GigabitEthernet0/2, Prune/Sparse, 01:01:03/00:01:05

---------------------------------------------------------------------

R1#show ip pim neighbor
PIM Neighbor Table
Mode: B - Bidir Capable, DR - Designated Router, N - Default DR Priority,
P - Proxy Capable, S - State Refresh Capable, G - GenID Capable,
L - DR Load-balancing Capable
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
172.16.12.2 GigabitEthernet0/0 01:26:11/00:01:16 v2 1 / DR S P G

R1#show ip igmp groups
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter Group Accounted
224.0.1.40 Loopback0 01:27:38 00:02:22 1.1.1.1

R1#show 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

(*, 224.0.1.39), 01:27:43/stopped, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
GigabitEthernet0/0, Forward/Sparse, 01:27:43/stopped

(3.3.3.3, 224.0.1.39), 00:01:30/00:01:29, flags: PT
Incoming interface: GigabitEthernet0/0, RPF nbr 172.16.12.2
Outgoing interface list: Null

(*, 224.0.1.40), 01:27:48/stopped, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Loopback0, Forward/Sparse, 01:27:48/stopped
GigabitEthernet0/0, Forward/Sparse, 01:27:48/stopped

(3.3.3.3, 224.0.1.40), 01:27:45/00:02:56, flags: LT
Incoming interface: GigabitEthernet0/0, RPF nbr 172.16.12.2
Outgoing interface list:
Loopback0, Forward/Sparse, 01:27:45/stopped

R1#show ip mroute count
Use "show ip mfib count" to get better response time for a large number of mroutes.

IP Multicast Statistics
4 routes using 1980 bytes of memory
2 groups, 1.00 average sources per group
Forwarding Counts: Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts: Total/RPF failed/Other drops(OIF-null, rate-limit etc)

Group: 224.0.1.39, Source count: 1, Packets forwarded: 0, Packets received: 1
Source: 3.3.3.3/32, Forwarding: 0/0/0/0, Other: 1/0/1

Group: 224.0.1.40, Source count: 1, Packets forwarded: 498, Packets received: 501
Source: 3.3.3.3/32, Forwarding: 498/0/48/0, Other: 501/3/0