Multicast routing

[Cisconew]

Hi,

Below is my task to do. I have configured as per below network topology. Unicast routing is working from receiver to source and vice versa. But multicast routing is not working. I need to know the reasons for this and also the task question also.Please help me.

Task:

Only BGP is running on the routers. Each router is in its own ASN. Only the LAN networks (where servers are connected) and the loopback0 addresses are advertised via BGP using network statements. BGP synchronization is disabled. Transit networks are not advertised. There are no default networks. PIM sparse mode is configured on all interfaces and the RP is set to 3.3.3.3(Router 3) on all routers.
Router 3 is hitting 100% CPU utilization and dropping packets because of the high CPU. What could be causing this?

[MHM Cisco World]

I need to See R1 and R4 config

Also 

Show ip route

in R1 and R4

[Cisconew]

Hi,

Please find below the configurations of R1 and R4

R1:

hostname R1
!

mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180

ip multicast-routing
ip cef
no ipv6 cef
!
multilink bundle-name authenticated
!

redundancy
!

interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface GigabitEthernet0/0
ip address 10.10.10.1 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet0/1
ip address 192.168.12.1 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet0/2
ip address 192.168.14.1 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
media-type rj45
!

router bgp 100
bgp router-id 1.1.1.1
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
network 10.10.10.0 mask 255.255.255.0
neighbor 192.168.12.2 remote-as 200
neighbor 192.168.14.4 remote-as 400
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
ip pim rp-address 3.3.3.3
!
ipv6 ioam timestamp




R4:

hostname R4
!
boot-start-marker
boot-end-marker
!
!
!
no aaa new-model
!
!
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
!
ip multicast-routing
ip cef
no ipv6 cef
!
multilink bundle-name authenticated
!
redundancy
!
interface Loopback0
ip address 4.4.4.4 255.255.255.255
!
interface GigabitEthernet0/0
ip address 10.100.100.4 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet0/2
ip address 192.168.14.4 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
media-type rj45
!
interface GigabitEthernet0/3
ip address 192.168.34.4 255.255.255.0
ip pim sparse-mode
duplex auto
speed auto
media-type rj45
!
router bgp 400
bgp router-id 4.4.4.4
bgp log-neighbor-changes
network 4.4.4.4 mask 255.255.255.255
network 10.100.100.0 mask 255.255.255.0
neighbor 192.168.14.1 remote-as 100
neighbor 192.168.34.3 remote-as 300
!
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
ip pim rp-address 3.3.3.3
!
ipv6 ioam timestamp
!
!
!
control-plane

[MHM Cisco World]

Show ip route

in R1 and R4

And config of R3

[Cisconew]

Please find below the routing tables of R1 and R4

R1:

R1#sh ip route | b Gate
Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
B 2.2.2.2 [20/0] via 192.168.12.2, 00:46:28
3.0.0.0/32 is subnetted, 1 subnets
B 3.3.3.3 [20/0] via 192.168.14.4, 00:46:29
4.0.0.0/32 is subnetted, 1 subnets
B 4.4.4.4 [20/0] via 192.168.14.4, 00:46:29
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C 10.10.10.0/24 is directly connected, GigabitEthernet0/0
L 10.10.10.1/32 is directly connected, GigabitEthernet0/0
B 10.100.100.0/24 [20/0] via 192.168.14.4, 00:46:29
192.168.12.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.12.0/24 is directly connected, GigabitEthernet0/1
L 192.168.12.1/32 is directly connected, GigabitEthernet0/1
192.168.14.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.14.0/24 is directly connected, GigabitEthernet0/2
L 192.168.14.1/32 is directly connected, GigabitEthernet0/2




R4:

R4#sh ip route | b Gate
Gateway of last resort is not set

1.0.0.0/32 is subnetted, 1 subnets
B 1.1.1.1 [20/0] via 192.168.14.1, 00:48:10
2.0.0.0/32 is subnetted, 1 subnets
B 2.2.2.2 [20/0] via 192.168.14.1, 00:47:41
3.0.0.0/32 is subnetted, 1 subnets
B 3.3.3.3 [20/0] via 192.168.34.3, 00:48:10
4.0.0.0/32 is subnetted, 1 subnets
C 4.4.4.4 is directly connected, Loopback0
10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
B 10.10.10.0/24 [20/0] via 192.168.14.1, 00:48:10
C 10.100.100.0/24 is directly connected, GigabitEthernet0/0
L 10.100.100.4/32 is directly connected, GigabitEthernet0/0
192.168.14.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.14.0/24 is directly connected, GigabitEthernet0/2
L 192.168.14.4/32 is directly connected, GigabitEthernet0/2
192.168.34.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.34.0/24 is directly connected, GigabitEthernet0/3
L 192.168.34.4/32 is directly connected, GigabitEthernet0/3

[MHM Cisco World]

the BGP make path for R1 via R4 to reach R3. 
that I think issue here,
you need to Make R1 path not via R4 
the simple solution is

router bgp R1
neighbor R4 route-map MHM in 
route-map MHM permit 10 

set weight 100

[Harold Ritter]

Hi @MHM Cisco World ,

I am not sure why this would be an issue. PIM register messages would still be able to get from R1 to R3. The issue that I explained before would still apply as R1 would send PIM register with a source of 192.168.14.1 and R3 does not know how to reach that address, as transit subnets are not advertised in BGP. Using

ip pim register-source Loopback0

on R1 would fix this issue.

Regards,

[Cisconew]

Reciver's configuration;

Receiver#sh run int g 0/0
Building configuration...

Current configuration : 168 bytes
!
interface GigabitEthernet0/0
ip address 10.100.100.10 255.255.255.0
ip pim sparse-mode
ip igmp join-group 229.7.7.7
duplex auto
speed auto
media-type rj45
end

Ping is successful from Source to receiver

Receiver#ping 10.10.10.10
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.10, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 5/6/9 ms
Receiver#trace 10.10.10.10 num
Type escape sequence to abort.
Tracing the route to 10.10.10.10
VRF info: (vrf in name/id, vrf out name/id)
1 10.100.100.4 2 msec 2 msec 2 msec
2 192.168.14.1 5 msec 3 msec 4 msec
3 10.10.10.10 4 msec * 4 msec

Receiver#mtrace 10.10.10.10
Type escape sequence to abort.
Mtrace from 10.10.10.10 to 10.100.100.10 via RPF
From source (?) to destination (?)
Querying full reverse path...
0 10.100.100.10
-1 10.100.100.10 ==> 10.100.100.10 PIM/Static [default]
-2 10.100.100.4 ==> 192.168.14.4 PIM/MBGP [10.10.10.0/24]
-3 192.168.14.1 ==> 10.10.10.1 PIM_MT [10.10.10.0/24]
-4 10.10.10.10

[MHM Cisco World]

Check my comment above' 

You need to change path of R1 to R3.

Do this and check again.

[Cisconew]

Source Configuration:

Source#ping 10.100.100.10
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.100.100.10, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/6 ms
Source#trace 10.100.100.10
Type escape sequence to abort.
Tracing the route to 10.100.100.10
VRF info: (vrf in name/id, vrf out name/id)
1 10.10.10.1 2 msec 2 msec 2 msec
2 192.168.14.4 4 msec 4 msec 4 msec
3 10.100.100.10 5 msec 5 msec *
Source#mtrace 10.100.100.10
Type escape sequence to abort.
Mtrace from 10.100.100.10 to 10.10.10.10 via RPF
From source (?) to destination (?)
Querying full reverse path...
*Jul 13 16:22:18.816: %SYS-2-BADSHARE: Bad refcount in datagram_done, ptr=E039BE0, count=0
-Traceback= 2222FEz 1C89541z 1C834ADz* switching to hop-by-hop:
0 10.10.10.10
-1
*Jul 13 16:22:30.825: %SYS-2-BADSHARE: Bad refcount in datagram_done, ptr=E03B4B8, count=0
-Traceback= 2222FEz 1C89541z 1C834ADz*
*Jul 13 16:22:33.824: %SYS-2-BADSHARE: Bad refcount in datagram_done, ptr=E03A0D8, count=0
-Traceback= 2222FEz 1C89541z 1C834ADz*
*Jul 13 16:22:36.823: %SYS-2-BADSHARE: Bad refcount in datagram_done, ptr=E03D780, count=0
-Traceback= 2222FEz 1C89541z 1C834ADz* Timed out receiving responses
Perhaps no local router has a route for source, the receiver is not
a member of the multicast group or the multicast ttl is too low.


Source#ping 229.7.7.7 repeat 10000
Type escape sequence to abort.
Sending 10000, 100-byte ICMP Echos to 229.7.7.7, timeout is 2 seconds:
......................................................................
......................................................................
......................................................................

[Harold Ritter]

Hi @Cisconew ,

To fix the issue of not being able to ping the receiver, you need to remove all the multicast configuration from the receiver, except

ip igmp join-group 229.7.7.7

and reload the receiver.

Regards,

[Cisconew]

Full configuration of Receiver:

Receiver#sh run
Building configuration...

Current configuration : 3026 bytes
!
version 15.7
!
hostname Receiver
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180

ip multicast-routing
ip cef
no ipv6 cef
!
multilink bundle-name authenticated
!
redundancy

interface GigabitEthernet0/0
ip address 10.100.100.10 255.255.255.0
ip pim sparse-mode
ip igmp join-group 229.7.7.7
duplex auto
speed auto
media-type rj45
!

!
ip default-gateway 10.100.100.4
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
ip route 0.0.0.0 0.0.0.0 10.100.100.4
!
ipv6 ioam timestamp

[Harold Ritter]

Hi @Cisconew ,

As mentioned in my previous post, the receiver should be configured as a host, not a multicast router.

You need to do the following:

no ip routing

ip default-gateway 10.100.100.4

no ip multicast-routing

int gi0/0

no ip pim sparse-mode

It should work after.

Regards,

[Cisconew]

Hi,

Do you think I should remove these configurations on Source host too?.Here I have given

rp address

command too.

Source#sh run

Building configuration...


hostname Source
!

!
no ip routing
!
!
!
!
!
!
ip multicast-routing
no ip cef
no ipv6 cef
!
multilink bundle-name authenticated
!

!
interface GigabitEthernet0/0
ip address 10.10.10.10 255.255.255.0
ip pim sparse-mode
no ip route-cache
duplex auto
speed auto
media-type rj45
!

ip default-gateway 10.10.10.1
ip forward-protocol nd
!
!
no ip http server
no ip http secure-server
ip pim rp-address 3.3.3.3

[Harold Ritter]

Hi @Cisconew ,

The source doesn't need any multicast configuration whatsoever. So you can remove all of it.

no ip routing

no ip multicast-routing

int gi0/0

no ip pim sparse-mode

!

no ip pim rp-address 3.3.3.3

Regards,