PIM Multicast Routing Over GRE Tunnels

Version 32.3 adds the ability to configure IPv4 Protocol Independent Multicast (PIM) traffic over GRE tunnels. PIM control packets are exchanged between GRE tunnel endpoints across the GRE tunnel, forming a PIM neighborship across the GRE tunnel. Similar to IPv4 unicast support on GRE tunnels, multicast data packets are routed from a tenant interface to the far end of the IPv4 GRE tunnel. The IPv4 next-hop for the multicast packets is the IPv4 tunnel IP of the BGP neighbor.

Supported Platforms

ExtremeSwitching 5520 and 5720 series switches.

Limitations

This feature has the following limitations:

The maximum number of GRE tunnels supported is 64.
The maximum number of VRs supported is 32.
Routing across VRs is not supported.
IPv6 multicast routing over tunnel is not supported.
MSDP is not supported with this feature.
This feature is not supported on a stack.

New CLI Commands

The following new CLI commands support this feature:

configure pim {ipv4} add {tunnel} [tunnel_name | tunnel all] {sparse | dense} {passive}

configure pim {ipv4} delete tunnel [tunnel_name | tunnel all]

configure pim {ipv4} timer hello_interval jp_interval [{tunnel} tunnel_name | tunnel all]

configure pim {ipv4} [{tunnel} tunnel_name | tunnel all] dr-priority priority

disable ipmcforwarding {tunnel tunnel_name}

disable pim {ipv4} ssm tunnel [tunnel_name | tunnel all]

enable ipmcforwarding {tunnel tunnel_name}

enable pim {ipv4} ssm tunnel [tunnel_name | tunnel all]

show pim tunnel

unconfigure pim {ipv4}{tunnel tunnel_name}