JUNOS Internet Software Network Operations Guide: Hardware
474 ! Routing Engine, Host Module, and Host Subsystem Redundancy Connections
Redundancy Connection for a T320 Router and T640 Routing Node
Figure 191 shows the connection between the master and backup host modules on
a T320 router or a T640 routing node with a Routing Engine 600 (RE-600).
Keepalive messages are sent from one Routing Engine to the other over the
fxp2
interface found on the Routing Engine. The keepalive message is received by the
other host module via the
fpx1 interface. A keepalive message is sent back over the
fxp2 interface of the other Routing Engine. In this way, the master and the backup
host subsystems exchange state information.
Figure 191: Redundancy Connection for a T320 Router or T640 Routing Node (RE-600)
keepalive messages
physical connection
Master Host Subsystem
RE0
CB0 CB1
RE1
Backup Host Subsystem
PCI bridge PCI bridge
g002282
Switch Switch
FXP1
FXP1
FXP2
FXP2
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