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New Member

Nexus multicast rp problem

Customer running Nexus 7000 6.03a.  Core and Distribution VDCs.  With the static RP configuration shown below,

a source in VLAN 300 attached to a L2 Catalyst 6500, and a receiver on eth 1/14 on the core, multicast traffic

in groups 234.5.6.7-234.5.6.11 is delivered successfully from source to receiver.  When we try to use anycast-rp,

replacing the staic rp config in the distribution VDC with the 2 lines below, all traffic fails.

ip pim anycast-rp 10.129.26.146 10.129.26.133     <==== Other distribution VDC loopback 100 IP

ip pim anycast-rp 10.129.26.146 10.129.26.134     <==== Local distribution VDC loopback 100 IP  

Loopback 99 is the anycast RP 'virtual' address, loopback 100 is the local RP used for anycast rp-to-rp communication.  

Debugging pim joins generates a message 'no rp found for group x.x.x.x' for all five groups on

the distribution VDC.  The core pim debug shows no errors.

Unicast routing (BGP and static) IP addressing is working correctly. IGMP/IGMP snooping also appears correct,

and we are seeing the groups joined on the core VDC.

I am at a loss to explain why the distribution VDC cannot recognize itself as an RP.  Does anyone have an idea?

Some additional config notes:

There are two Nexus chassis, each split into core and distributtion VDCs.  There is a VPC between the distribution VDCs,

with member vlans trunked to a pair of 6509s, operating at layer 2 only. Vlan 300, the source vlan, is a vpc member.

The source is attached to a 6509 port in Vlan 300.

Each distribution VDC has a pairof layer 3 ports, each connected to one of the core VDCs.  The core VDCs have a layer 3

link between them, and the distribution VDCs have a layer 3 link outside the vpc.  Basically, the L3 is a bow-tie,

with horizotal cross links as well.  PIM is running on all L3 links, as well on vlan 300, and the loopbacks used for RP. 

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

Distribution VDC

ip pim rp-address 10.129.26.146 group-list 224.0.0.0/4

ip pim log-neighbor-changes

ip pim ssm range 232.0.0.0/8

interface Vlan300

  ip address 10.129.26.67/28

  ip pim sparse-mode

  ip pim dr-priority 200

  hsrp 200

    preempt

    priority 150

    ip 10.129.26.65

  ip dhcp relay address 10.129.26.84

  description Dist Server VLAN 300

  no shutdown

interface loopback99

  ip address 10.129.26.146/32

  ip pim sparse-mode

interface loopback100

  ip address 10.129.26.134/32

  ip pim sparse-mode

interface Ethernet5/1

  description cidcnxsw2-DIST to cidcnxsw2-CORE

  no switchport

  ip address 10.129.26.246/30

  ip pim sparse-mode

  no shutdown

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

Core VDC

ip pim rp-address 10.129.26.146 group-list 224.0.0.0/4

ip pim ssm range 232.0.0.0/8

interface Vlan111

  description Multicast Anycast Test VLAN

  no shutdown

  ip address 10.129.27.35/27

  ip pim sparse-mode

interface Ethernet1/14

  description Test PC

  switchport

  switchport access vlan 111

  no shutdown

interface Ethernet2/1

  description cidcnxsw2-CORE to cidcnxsw2-DIST

  ip address 10.129.26.245/30

  ip pim sparse-mode

  no shutdown

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

Everyone's tags (3)
1 ACCEPTED SOLUTION

Accepted Solutions

Nexus multicast rp problem

Hi

If you configure anycast-RP you still need the config-line for the static-rp. So you need these 3 lines on your anycast-rp-routers:

ip pim anycast-rp 10.129.26.146 10.129.26.133   

ip pim anycast-rp 10.129.26.146 10.129.26.134

ip pim rp-address 10.129.26.146 group-list 224.0.0.0/4

Line 1 & 2 providing the anycast RP (you configure a redundant RP) - but you still need the third line to tell your routers where they find the RP.

HTH

Marcel

3 REPLIES

Nexus multicast rp problem

Hi

If you configure anycast-RP you still need the config-line for the static-rp. So you need these 3 lines on your anycast-rp-routers:

ip pim anycast-rp 10.129.26.146 10.129.26.133   

ip pim anycast-rp 10.129.26.146 10.129.26.134

ip pim rp-address 10.129.26.146 group-list 224.0.0.0/4

Line 1 & 2 providing the anycast RP (you configure a redundant RP) - but you still need the third line to tell your routers where they find the RP.

HTH

Marcel

New Member

Nexus multicast rp problem

Marcel,

Thanks - that makes sense.  We still need to do full testing, but I think this will addressw the issue.

Re: Nexus multicast rp problem

Glad I could help. Have a nice day

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