hot-standby-vc-on (Protocols Layer 2 Circuit)
Statement introduced in Junos OS Release 13.2.
Support for VPLS routing instances added in Junos OS Release 15.1R2.
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.