EVPN

Exception policy for enhanced OISM to avoid multicast traffic loss on packets with TTL=1 (QFX5130-32CD, QFX5130-48C, QFX5130-48CM, and QFX5700)—Enhanced optimized intersubnet multicast (OISM) routes most multicast traffic on the OISM supplemental bridge domain (SBD) rather than on the 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 don't reach the receivers. To avoid this problem on enhanced OISM devices, use the following steps to configure the devices to use the source VLAN instead of the SBD to forward multicast data to remote receivers:

1. Configure a routing policy policy-name at the [edit policy-options policy-statement] hierarchy level to match the multicast groups (or sources and groups) for which to forward multicast traffic on the source VLAN.

2. Set the forward-policy policy-name option at the [edit routing-instances VRF-instance-name protocols evpn oism enhanced forward-on-source-bridge-domain] hierarchy level to enable forwarding on the source VLAN instead of on the SBD for the multicast groups (or sources and groups) that match the policy.

You can configure and apply multiple policies with the forward-policy option.

[See forward-on-source-bridge-domain and Enhanced OISM Exception Policy to Forward on Source VLAN Instead of SBD for Packets with TTL=1.]

You can configure enhanced optimized intersubnet multicast (OISM) and seamless Data Center Interconnect (DCI) with EVPN-VXLAN instances on an IPv6 underlay. In EVPN-VXLAN DCI fabrics with enhanced OISM and an IPv6 underlay, DCI gateway (iGW) devices send EVPN Type 6 Selective Multicast Ethernet Tag (SMET) routes to remote iGW devices when hosts subscribe to multicast groups. iGW devices in the source data center selectively forward multicast traffic for a group across the DCI only if the remote data center has receivers subscribed to that group. Previously, the iGW devices always flooded multicast traffic across the interconnection even when the remote data center had no subscribed receivers.

[See EVPN-VXLAN DCI Multicast with Enhanced OISM.]

Support for excluding MAC addresses from duplicate MAC detection (ACX7100-32C, PTX10004, PTX10008, PTX10016, QFX5130-32CD, QFX5130-48C, QFX5130-48CM, and QFX5700)—You can configure an exclusion list for MAC addresses in EVPN networks to prevent legitimate MAC address movements from being marked as duplicates. Use set protocols evpn mac-list list_name mac-address mac_address_with_prefix_len to create the list and set protocols evpn duplicate-mac-detection exclude-list list_name to apply it. This feature helps maintain network stability by avoiding unnecessary duplicate MAC detection for specified addresses, particularly in scenarios involving virtual MAC configurations in redundant setups.

[See EVPN Duplicate MAC Detection Exclusion Lists.]