show multicast next-hops session
Syntax
show multicast next-hops session <session-identifier>
Description
Show EVPN multicast next hop session information for designated forwarder (DF) status on multihomed EVPN data center interconnect (DCI) gateway (iGW) devices that share an interconnect Ethernet segment ID (I-ESI).
When you interconnect EVPN data centers, the multihomed iGW devices in an I-ESI have a designated forwarder (DF) that forwards traffic across the interconnection and to local receivers. Other iGW devices that are not the DF (NDF or backup DF [BDF]) forward traffic only to local receivers. The control plane on the iGW devices determines the next hops for the DF and NDF iGW devices, and installs the next hops on the Packet Forwarding Engine (PFE) to efficiently forward traffic toward the destinations.
To improve next hop information convergence in the PFE for EVPN multicast traffic over DCI, the IGW devices use a session model to track I-ESI DF and NDF status and multicast next hop information. The iGW device control plane assigns a session ID to the DF and NDF device sessions, and sends session status update messages to the PFE when the DF status for the I-ESI changes. Upon receiving DF and NDF session status updates, the PFE can quickly update its forwarding paths accordingly.
Use this command to see the DF and NDF session information for the I-ESI on iGW devices that you configure to support enhanced optimized intersubnet multicast (OISM) traffic across DCI.
Options
| session-identifier |
Display information only for the specified I-ESI multicast next hops session ID. |
Required Privilege Level
view
Output Fields
Output fields are listed in the approximate order in which they appear.
|
Field Name |
Field Description |
|---|---|
|
MCNH session ID |
ID the control plane assigned internally to the multicast next hops session. |
|
Role |
Device role for the session:
|
|
L3 VRF |
Corresponding Layer 3 (L3) virtual routing and forwarding (VRF) routing instance. |
|
State |
DF or NDF multicast next hops session state: UP or DOWN |
|
References |
Reference count. |
Sample Output
show multicast next-hops session
user@GW11> show multicast next-hops session
MCNH session ID: 356
Role: DF
L3 VRF: VRF-1
State: UP
References: 2
MCNH session ID: 355
Role: NDF
L3 VRF: VRF-1
State: DOWN
References: 2
show multicast next-hops session session-identifier
user@GW11> show multicast next-hops session 356
MCNH session ID: 356
Role: DF
L3 VRF: VRF-1
State: UP
References: 2
Release Information
Statement introduced in Junos OS Release 24.2R1.