forward-on-source-bridge-domain

Syntax

Hierarchy Level

Description

When running enhanced optimized intersubnet multicast (OISM), forward multicast data traffic that matches the provided forwarding policy (or policies) on the multicast source bridge domain (VLAN).

Enhanced OISM routes most multicast traffic on the OISM SBD allocated to a Layer 3 (L3) virtual routing and forwarding (VRF) instance, rather than on the multicast source VLAN, even if the destination OISM device hosts the source VLAN. This extra routing decrements a packet’s time-to-live (TTL) more than once, so packets with TTL=1 won't reach the receivers.

To avoid this problem, use this statement to apply an exception policy on enhanced OISM devices to use the source VLAN instead of the SBD for remote receivers that subscribe to specific multicast groups (or sources and groups). You configure routing policies to match the multicast groups [(*,G)] or multicast sources and groups [(S,G)] for which you want the device to forward multicast traffic on the source VLAN.

You can configure this option only when you configure the device to use OISM in enhanced OISM mode. To enable enhanced OISM, see the enhanced-oism option at the [edit forwarding-options multicast-replication evpn irb] hierarchy level.

For details on how OISM works and all of the elements you need to configure OISM in an EVPN fabric, see Optimized Intersubnet Multicast in EVPN Networks.

For more on using this feature, see Enhanced OISM Exception Policy to Forward on Source VLAN Instead of on SBD.

Options

(Required) forward-policy [ forwarding-policy-name ... ]

Routing policy or policies to match multicast groups (or sources and groups) for which the device should forward that multicast traffic on the source VLAN.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS and Junos OS Evolved Release 25.2R1.