show virtual-chassis vc-path

Syntax

Description

Show the forwarding path a packet takes when going from a source interface to a destination interface in a Virtual Chassis or VCF configuration.

Starting in Junos OS Releases 14.1X53-D40, 15.1R5, and 16.1R3, when used in VCF configurations, this command displays additional information about next hops, including when the forwarding path has multiple possible next hops within the VCF.

Options

source-interface `interface-name`	Name of the interface from which the packet originates in the Virtual Chassis or VCF
destination-interface `interface-name`	Name of the interface to which the packet is being delivered in the Virtual Chassis or VCF

Required Privilege Level

view

Output Fields

Table 1 lists the output fields for the show virtual-chassis vc-path command. Output fields are listed in the approximate order in which they appear.

Some output field names and display order differ between the output for a Virtual Chassis and for a VCF. When this command is used to display forwarding paths in a VCF, additional fields are included in the output to show details of multiple possible next hops. The differences are described in Table 1 and shown in sample output for each mode.

Table 1: show virtual-chassis vc-path Output Fields
Field Name	Field Description
`Hop`	The hop number along the path between the source and destination interfaces. The first hop entry (`Hop 0`) is the packet’s source, intermediate hop information represents transitions through the members within the Virtual Chassis or VCF, and the last hop entry represents arrival at the packet’s destination. For VCF output, each `Hop` entry also shows information about multiple possible next hops towards the destination. See `Next-hop PFE`, `Interface`, and `Bandwidth` output field descriptions for details.
`Member` (Virtual Chassis) `Member-ID` (VCF)	The Virtual Chassis or VCF member ID of the switch that contains the Packet Forwarding Engine for each hop through which the packet passes.
`PFE-Device`(Virtual Chassis) `PFE`(VCF)	The number of the Packet Forwarding Engine in each Virtual Chassis or VCF member through which a packet passes. For Virtual Chassis output, the Packet Forwarding Engine in each row is the next hop of the preceding Packet Forwarding Engine, including intermediate transitions through members within the Virtual Chassis. VCF output is expanded on multiple rows to show more information about multiple possible next hops—each hop entry is followed by one or more `Next-hop PFE` output fields with interface name and bandwidth information for each possible next hop.
`Next-hop PFE` (VCF only)	One or more possible next-hop Packet Forwarding Engine numbers for VCF member `Member-ID`. Each `Next-hop` entry includes the next-hops’s interface name and bandwidth.
`Interface`	The name of the interface through which the Packet Forwarding Engines are connected. The interface for the first hop (`Hop 0`) is always the source interface. VCF output provides more information about multiple possible next hops for each hop entry, listing the `Interface` and the interface `Bandwidth` for each possible `Next-hop PFE`.
`Bandwidth` (VCF only)	The bandwidth (in Gbps) of the next-hop interface for the associated `Next-hop PFE` entry.

Sample Output

show virtual-chassis vc-path source-interface destination-interface (Virtual Chassis)
show virtual-chassis vc-path source-interface destination-interface (Virtual Chassis Fabric)