Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 391)

NOTE
BGP4 restart is supported in FSX 800, FSX 1600 devices with dual management modules, FCX
switches in a stack and ICX switches in a stack. If the switch will function as a restart helper device
only, a secondary management module is not required.
NOTE
A second management module must be installed for the device to function as a restart device. If the
device functions as a restart helper device only, there is no requirement for a secondary management
module.
The implementation of BGP4 Restart supports the following Internet Draft:
• Draft-ietf-idr-restart-10.txt: restart mechanism for BGP4
BGP4 Peer notification during a management module switchover
The BGP4 Peer notification process restores BGP4 adjacency quickly and allows packet forwarding
between the newly active management module and the BGP4 peers. The handling of TCP packets with
an MD5 digest prevents the silent dropping of TCP packets without triggering a RESET packet.
The BGP4 peer notification process operates effectively when implemented for the following processes
that involve the intentional switching of the active status from one management module to another:
• System Reload - When a device undergoes the reload process, both management modules and all
interface modules are rebooted. All BGP4 sessions are terminated BEFORE the system triggers the
hardware reset.
• Switchover Requested by User - Switching over to a standby management module can be triggered
by the switchover , reset , reload , and hitless-reload commands. When these commands are
executed, the active management module resets the BGP4/TCP sessions with BGP4 neighbors
before transferring control to the standby management module.
NOTE
Restart-enabled BGP4 sessions are not reset. The BGP4 restart protocol allows a BGP4 session to
reconnect gracefully without going through the normal process.
This example describes the procedure used between the management modules in a device and a
BGP4 neighbor device.
BGP4 Peer notification during a management module switchover
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