PLANET XGS3-24042 - Manual (Page 396)

46-14
bgp graceful-restart stale-path-time
<1-3600>
no bgp graceful-restart
stale-path-time <1-3600>
Stalepath-time uses the default value of 360s,
which is much longer than restart-time and
selection-deferral-time. Because during the time
from Receiving Speaker receives OPEN
messages to receives EOR, it sends the initial
route update and waits that the initial route
update is received completely.
6. Configure selection-deferral-time for BGP GR
Command Explanation
BGP route configuration mode
bgp selection-deferral-time
<1-3600>
no bgp selection-deferral-time
<1-3600>
Specify the longest waiting time that start to
count selection route from the received OPEN
messages to the received EOR for Restarting
Speaker. If Restarting Speaker does not receive
EOR after exceed the time, it can count
selection route.
46.3 Typical Example of GR
Figure 46-2 Application environment for GR
As shown in Figure 46-2, R1 and R2 establish BGP neighborhood. When they cut off the connection, BGP
protocol in R2 will be in helper mode, keep route entry from R1 to R2 and restart restart-time timer. During that
time, if it receives open messages from R1 or timer is overtime, the route marked with stale in R2 will be
deleted. When they establish neighborhood again, R1 will enable selection timer and wait R2 to send EOR
messages or until timer is overtime, R1 is a selection route. However, after R2 receives open messages from
R1, it enables STALE route timer and it will delete timer and stale route when accept EOR from R1 or timer is
overtime.
R1 configures int vlan 12，ip address 12.1.1.1
BGP neighborhood
R1
AS1
R2
GR-Helper
AS2