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Graceful Routing Engine Switchover Feature Support

Graceful Routing Engine switchover supports most JUNOS software features in Release 5.7 and later. Particular JUNOS software features require specific versions of the JUNOS software. See Table 9.

Table 9: Graceful Routing Engine Switchover Feature Support

Application	JUNOS Release
Aggregated Ethernet interfaces with Link Aggregation Control Protocol (LACP) and aggregated SONET interfaces	6.2
Asynchronous Transfer Mode (ATM) virtual circuits (VCs)	6.2
Logical systems Note: Beginning with JUNOS software Release 9.3, the logical router feature has been renamed logical system.	6.3
Multicast	6.4 (7.0 for TX Matrix)
Multilink Point-to-Point Protocol (MLPPP) and Multilink Frame Relay (MLFR)	7.0
Automatic Protection Switching (APS)—The current active interface (either the designated working or the designated protect interface) remains the active interface during a Routing Engine switchover.	7.4
Point-to-multipoint Multiprotocol Label Switching MPLS LSPs (transit only)	7.4
Compressed Real-Time Transport Protocol (CRTP)	7.6
Virtual private LAN service (VPLS)	8.2
Ethernet Operation, Administration, and Management (OAM) as defined by IEEE 802.3ah	8.5
Extended DHCP relay agent	8.5
Ethernet OAM as defined by IEEE 802.1ag	9.0
Packet Gateway Control Protocol (PGCP) process (pgcpd) on MultiServices 500 PICs on T640 routers.	9.0

The following constraints apply to graceful Routing Engine switchover feature support:

When graceful Routing Engine switchover and aggregated Ethernet interfaces are configured in the same system, the aggregated Ethernet interfaces must not be configured for fast-polling LACP. When fast polling is configured, the LACP polls time out at the remote end during the Routing Engine mastership switchover. When LACP polling times out, the aggregated link and interface are disabled. The Routing Engine mastership change is fast enough that standard and slow LACP polling do not time out during the procedure.
VRRP changes mastership when a Routing Engine switchover occurs, even when graceful Routing Engine switchover is configured.
The extended DHCP local server does not support graceful Routing Engine switchover. Address-assignment pools do not support graceful Routing Engine switchover. For more information, see the JUNOS System Basics Configuration Guide.

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