primary (Virtual Tunnel in Routing Instances)
Syntax primary;
Hierarchy Level [edit logical-systems logical-system-name routing-instances routing-instance-name interface
vt-fpc/pic/port.unit-number],
[edit routing-instances routing-instance-name interface vt-fpc/pic/port.unit-number]
Release Information Statement introduced in Junos OS Release 12.3.
Description In a multiprotocol BGP (MBGP) multicast VPN (MVPN), configure the virtual tunnel (VT)
interface to be used as the primary interface for multicast traffic.
Junos OS supports up to eight VT interfaces configured for multicast in a routing instance
to provide redundancy for MBGP (next-generation) MVPNs. This support is for RSVP
point-to-multipoint provider tunnels as well as multicast Label Distribution Protocol
(MLDP) provider tunnels. This feature works for extranets as well.
This statement allows you to configure one of the VT interfaces to be the primary interface,
which is always used if it is operational. If a VT interface is configured as the primary, it
becomes the nexthop that is used for traffic coming in from the core on the label-switched
path (LSP) into the routing instance. When a VT interface is configured to be primary
and the VT interface is used for both unicast and multicast traffic, only the multicast
traffic is affected.
If no VT interface is configured to be the primary or if the primary VT interface is unusable,
one of the usable configured VT interfaces is chosen to be the nexthop that is used for
traffic coming in from the core on the LSP into the routing instance. If the VT interface in
use goes down for any reason, another usable configured VT interface in the routing
instance is chosen. When the VT interface in use changes, all multicast routes in the
instance also switch their reverse-path forwarding (RPF) interface to the new VT interface
to allow the traffic to be received.
To realize the full benefit of redundancy, we recommend that when you configure multiple
VT interfaces, at least one of the VT interfaces be on a different Tunnel PIC from the
other VT interfaces. However, Junos OS does not enforce this.
Default If you omit this statement, Junos OS chooses a VT interface to be the active interface
for multicast traffic.
Required Privilege
Level
routing—To view this statement in the configuration.
routing-control—To add this statement to the configuration.
Related
Documentation
• Example: Configuring Redundant Virtual Tunnel Interfaces in MBGP MVPNs
• Example: Configuring MBGP MVPN Extranets
Copyright © 2017, Juniper Networks, Inc.1676
ACX Series Universal Access Router Configuration Guide
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