Routing Engine, Host Module, and Host Subsystem Redundancy Connections ! 469
Chapter 36: Host Redundancy Overview
Routing Engine, Host Module, and Host Subsystem Redundancy Connections
It is important to understand how a redundant Routing Engine, redundant host
module, or redundant subsystem communicates with its active counterparts to
avoid severing the connection used for communication. Severing the connection
can potentially trigger a failover protection.
For example, the M160 router active host module (the Routing Engine and the MCS)
has the running configuration on it and communicates with the MCS, which in turn
communicates with the Flexible PIC Concentrator (FPC) and the Switching and
Forwarding Modules (SFMs). The host modules send keepalive messages to each
other, checking the operating state. Each host module issues keepalive responses,
letting the other host module know that it is up and operating. If keepalive
responses are not returned to the standby host module (response times will vary
depending upon the time settings specified in the
set chassis redundancy
keepalive-time
statement), the standby host module can become the active host
module. (See “Redundancy Connection for an M40e or M160 Router” on page 472.)
You also can configure failover on the router to switch mastership if a critical
process fails. If a critical process on the active host module terminates, the standby
host module routing becomes the active host module. You can configure processes
for which this should happen. For example, you can use the
set interface-control
failover other-routing-engine
statement at the [edit system processes] hierarchy level
to configure failover for the interface control daemon.
For information about setting keepalive parameters, see “Configuring the Backup
Routing Engine to Assume Mastership on Failure of Keepalives” on page 486.
This section includes the following information:
! Redundancy Connection for an M10i Router on page 470
! Redundancy Connection for an M20 Router on page 471
! Redundancy Connection for an M40e or M160 Router on page 472
! Redundancy Connection for an M320 Router on page 473
! Redundancy Connection for a T320 Router and T640 Routing Node on
page 474
To Next Page
Loading...
Need help?
General
