MULTICAST issue

annirajput · ‎02-01-2023

Hi

Can any one tell me how I can disable fast switching on ISR4331-DC/K9.

I am facing issue multicast packets dropped

(10.71.6.246, 239.255.255.253), 00:02:03/00:00:56, flags: T
Incoming interface: Vlan100, RPF nbr 10.70.126.1
Outgoing interface list:
GigabitEthernet0/0/0, Forward/Dense, 00:02:03/stopped
GigabitEthernet0/0/1, Forward/Dense, 00:02:03/stopped
Vlan700, Prune/Dense, 00:02:03/00:00:56

johnd2310 · ‎02-01-2023

Hi,

Can you provide more details. What issues are you having with multicast? What is you multicast configuration?

Thanks

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annirajput · ‎02-01-2023

ip multicast-routing distributed

no ip redirects
no ip unreachables
no ip proxy-arp
ip pim query-interval 1
ip pim dense-mode
ip authentication mode eigrp 70 md5
ip authentication key-chain eigrp 70 RIDEII
no ip mfib cef input
ip pgm router
ip access-group 161 in
standby 1 ip 10.70.101.1
standby 1 priority 110
standby 1 preempt
ip igmp version 3
media-type rj45
negotiation auto

annirajput · ‎02-01-2023

interface GigabitEthernet0/0/1

no ip redirects
no ip unreachables
no ip proxy-arp
ip pim query-interval 1
ip pim dense-mode
ip authentication mode eigrp 70 md5
ip authentication key-chain eigrp 70 RIDEII
no ip mfib cef input
ip pgm router
ip access-group 161 in
standby 1 ip 10.70.101.1
standby 1 priority 110
standby 1 preempt
ip igmp version 3
media-type rj45
negotiation auto

johnd2310 · ‎02-01-2023

What\where is the multicast source and receiver? what happens with the multicast traffic? Does it start flowing and stops or does it not start at all?

thanks

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annirajput · ‎02-01-2023

Hi I have changed router Cisco 2851 to cisco ISR4331-DC/K9 and on new router only ip multicast-routing distributed available and fast switching enable but on old router ip multicast-routing only with process switching.

now on new router multicast packet discarded

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)
Default
26 routes, 11 (*,G)s, 2 (*,G/m)s
Group: 224.0.0.0/4
RP-tree,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 5/5/0
Group: 224.0.1.40
RP-tree,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Group: 239.253.0.61
RP-tree,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Group: 239.253.0.62
RP-tree,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Group: 239.253.0.63
RP-tree,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.70.6.32,
SW Forwarding: 245/0/70/0, Other: 33/33/0
HW Forwarding: 50/0/390/0, Other: 7/7/0
Totals - Source count: 1, Packet count: 295
Group: 239.255.255.250
RP-tree,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 101/101/0
Source: 10.70.6.5,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.70.6.7,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.70.6.8,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.70.6.31,
SW Forwarding: 0/0/0/0, Other: 1/0/1
HW Forwarding: 4/0/385/0, Other: 12/12/0
Source: 10.70.6.33,
SW Forwarding: 0/0/0/0, Other: 1/0/1
HW Forwarding: 4/0/385/0, Other: 10/10/0
Source: 10.70.6.35,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.70.6.37,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.70.6.95,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.70.6.196,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.70.6.198,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.71.6.196,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Source: 10.71.6.246,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0
Totals - Source count: 12, Packet count: 8
Group: 239.255.255.253
RP-tree,
SW Forwarding: 0/0/0/0, Other: 0/0/0
HW Forwarding: 0/0/0/0, Other: 0/0/0

Groups: 6, 2.16 average sources per group

annirajput · ‎02-01-2023

How I can disabled fast switching ?. below commands not taken

no ip route-cache cef
no ip route-cache
no ip mroute-cache

johnd2310 · ‎02-01-2023

Hi,

Can you draw a diagram of your multicast setup. Where is the source and where is the receiver? Do you have switches connected to the router?

Thanks

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paul driver · ‎02-01-2023

Hello
Not surprised as you are running pim-dense mcast, this will flood your whole network and then slowly prune unwarranted pim interfaces with no mc receivers, plus the fact if you don't have igmp snooping enabled on the switches mc traffic will be hitting every access port on the switch's in relation to each broadcast domain(vlan) you have pim enabled for

(10.71.6.246, 239.255.255.253), 00:02:03/00:00:56, flags: T
Incoming interface: Vlan100, RPF nbr 10.70.126.1 <---- MC coiming in from vla 700 via 10.70.126.1
Outgoing interface list:
GigabitEthernet0/0/0, Forward/Dense, 00:02:03/stopped
GigabitEthernet0/0/1, Forward/Dense, 00:02:03/stopped
Vlan700, Prune/Dense, 00:02:03/00:00:56 <---- prune has been received from vlan 700

Can you do the following and post the results:

mtrace 10.70.126.1
sh ip rpf 10.70.126.1
sh ip route 10.70.126.1

Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

annirajput · ‎02-02-2023

HI,

I replaced cisco 2851 to cisco 4331 . there is no issue with old router but on new router Multicast routing: enabled
Multicast switching: fast
Multicast packets in/out: 136238/266471
Multicast TTL threshold: 0
Multicast Tagswitching: disabled

and old router

Multicast routing: enabled
Multicast switching: process
Multicast packets in/out: 146673/115602
Multicast TTL threshold: 0
Multicast Tagswitching: disabled

below commands are missing on new router when i am trying to put these command then new router not accepting

no ip route-cache cef
no ip route-cache
no ip mroute-cache

annirajput · ‎02-02-2023

Routing entry for 10.70.126.0/30
Known via "connected", distance 0, metric 0 (connected, via interface)
Redistributing via eigrp 70
Routing Descriptor Blocks:
* directly connected, via Vlan100
Route metric is 0, traffic share count is 1

==========================================

mtrace 10.70.126.1
Type escape sequence to abort.
Mtrace from 10.70.126.1 to 10.70.126.2 via RPF
From source (?) to destination (?)
Querying full reverse path...
0 10.70.126.2
-1 10.70.126.2 ==> 10.70.126.2 PIM_MT [10.70.126.0/30]
-2 10.70.126.1

=========================================================

sho ip rpf 10.70.126.1
RPF information for ? (10.70.126.1)
RPF interface: Vlan100
RPF neighbor: ? (10.70.126.1) - directly connected
RPF route/mask: 10.70.126.0/30
RPF type: multicast (connected)
Doing distance-preferred lookups across tables
RPF topology: ipv4 multicast base

paul driver · ‎02-03-2023

Hello
So the RPF and unicast routing have parity , and it looks like you have an active host on vlan 700, as you are receiving a prune and expecting the next join/prune message in 56 secs

GigabitEthernet0/0/0 - 1 also seem to have any downstream activity.
What exactly your issue with your Multicast?

if you wish to disable fast switching for multicast then the command should be:
inx/x
no ip mroute-cache

Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

annirajput · ‎02-03-2023

no ip mroute-cache this command not running on ISR 4331

I think command is inx/x

ip multicast process-switching and one more thing router lan facing interface not join multicast group may be this is the issue.

interconnect interface joined multicast group

GigabitEthernet0/0/1 is up, line protocol is up >> this is LAN facing interface

Internet address is 10.70.101.4/24

IGMP is enabled on interface

Current IGMP host version is 3

Current IGMP router version is 3

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: 920 joins, 915 leaves

Multicast routing is enabled on interface

Multicast TTL threshold is 0

Multicast designated router (DR) is 10.70.101.4 (this system)

IGMP querying router is 10.70.101.3

No multicast groups joined by this system

======================================================================

GigabitEthernet0/0/0 is up, line protocol is up >>> this interface is interconnect with 2nd router

Internet address is 10.70.100.1/26

IGMP is enabled on interface

Current IGMP host version is 3

Current IGMP router version is 3

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: 3 joins, 2 leaves

Multicast routing is enabled on interface

Multicast TTL threshold is 0

Multicast designated router (DR) is 10.70.100.2

IGMP querying router is 10.70.100.1 (this system)

Multicast groups joined by this system (number of users):

224.0.1.40(1)

paul driver · ‎02-03-2023

Hello

@annirajput wrote:

IGMP activity: 3 joins, 2 leaves

Multicast routing is enabled on interface

Multicast designated router (DR) is 10.70.100.2

IGMP querying router is 10.70.100.1 (this system)

  Multicast groups joined by this system (number of users):

      224.0.1.40(1)

IGMP activity: 920 joins, 915 leaves

Multicast routing is enabled on interface

Multicast designated router (DR) is 10.70.101.4 (this system)

IGMP querying router is 10.70.101.3

  No multicast groups joined by this system

I can see igmp joins on those interfaces, but not specific mc group which suggests those interface are not requesting mc traffic any more

On thier directly connected upstrean pim neigbours can you show the mroute table and check for specific (S,G) entries i doubt you will see any?

Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

paul driver · ‎02-03-2023

Hello

@annirajput wrote:

(*, 239.253.0.62), 1d00h/00:02:06, RP 0.0.0.0, flags: D
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Vlan700, Forward/Dense, 1d00h/stopped
Vlan100, Forward/Dense, 1d00h/stopped
GigabitEthernet0/0/1, Forward/Dense, 1d00h/stopped
GigabitEthernet0/0/0, Forward/Dense, 1d00h/stopped

(10.70.6.32, 239.253.0.63), 1d02h/00:01:16, flags: T
Incoming interface: Vlan100, RPF nbr 10.70.126.1
Outgoing interface list:
GigabitEthernet0/0/0, Prune/Dense, 14:00:22/00:02:58, A
GigabitEthernet0/0/1, Forward/Dense, 1d02h/stopped, A
Vlan700, Prune/Dense, 1d02h/00:02:58

You can see from this output MC changed to a source tree but states it has NO group members to connect to, so it seems as stated previously no hosts for this group are interested.

Also assert flags are set, are those two interfaces sharing local subnets, Lasty do you just have dense mode and not sparse-dense mode enabled?

Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul