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JUNOSe 10.2.2 Release Notes
Subscriber Interfaces
32
Known Behavior
Stateful SRP switchover remains inactive for 20 minutes after an initial
cold-start or cold-restart of the router. This delay enables the system to reach a
stable configuration before starting stateful SRP switchover.
If you want to override the 20-minute timer, turn high availability off by using
the mode file-system-synchronization command, and then on again by using
the mode high-availability command.
When IP tunnels are configured on a router enabled for stateful SRP switchover,
and the Service Module (SM) carrying these tunnels is reloaded, stateful SRP
switchover transitions to the pending state. Stateful SRP switchover remains in
the pending state for 10 minutes following the successful reloading of the SM.
This amount of time allows for IP tunnel relocation and for the tunnels to
become operational again on the SM. If an SRP switchover occurs while in the
pending state, the router performs a cold restart.
Work-around: None.
After a stateful SRP switchover, each layer of the interface columns must
reconstruct its interfaces from the mirrored information. While the interfaces
are being reconstructed the SRP module cannot send or receive frames,
including the protocol frames that signal graceful restart behavior with OSPF
and IS-IS peers. If the configured hold time is too short, peers might mistakenly
declare the adjacency down during the time in which the graceful restart is
taking place. [Defect ID 65132]
Work-around: Increase the hold time to provide sufficient time for interface
synchronization before the peers declare the adjacency down.
For OSPF, use the ip ospf dead-interval command to set the hold time. We
recommend that you use Bidirectional Forwarding Detection (BFD) with a
longer OSPF dead interval to achieve fast failure detection.
For IS-IS, use the isis hello-interval and isis hello-multiplier commands to
set the hold time.
We recommend the following hold times for each protocol, based on the
number of interfaces.
Recommended Hold Time
Interface Count
for OSPF
16000 or less
80 seconds
16001 to 32000
87 seconds
32001 to 48000
90 seconds
MAC address validation is not supported on either of the following:
Packet-triggered subscriber interfaces that are created dynamically
Packet-triggered subscriber interfaces that are managed on the primary IP
interface
Recommended Hold Time
for IS-IS
50 seconds
55 seconds
70 seconds
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