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hot-standby-vc-on (Protocols Layer 2 Circuit)

 

Syntax

Hierarchy Level

Release Information

Statement introduced in Junos OS Release 13.2.

Support for VPLS routing instances added in Junos OS Release 15.1R2.

Description

On provider edge (PE) aggregation routers, configure the hot-standby-vc-on statement to indicate that a hot-standby pseudowire is desired upon arrival of a PW_FWD_STDBY status-tlv. This flag indicates the standby state. Configure in conjunction with the hot-standby statement on routers that have both active and standby virtual circuits. Generally, these are access routers.

The goal of the hot-standby statement is to reduce the amount of traffic being discarded during primary-to-backup transition periods. This statement enables the possibility of keeping both the active and standby paths open within the Layer 2 domain. By having both the active and standby VCs able to send and receive traffic, traffic loops could potentially occur within the Layer 2 domain. In consequence, Layer 2 VCs are kept open only in the PE-to-access direction. In other words, aggregation PE devices can send traffic toward access devices, but access devices send traffic exclusively through the active VC.

In this regard, the hot-standby statement is quite similar to the standby statement. The hot-standby statement allows for a faster forwarding-path switchover during transition periods, as compared to what is allowed by the standby statement.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.