H3C Technologies H3C S12500-X Series Switches - Manual (Page 20)

14
Step Command Remarks
3. Configure the EVI IS-IS
hello interval.
evi isis timer hello seconds
The default hello interval is 10 seconds.
If the edge device is a DED, its hello
interval is one-third of the hello interval set
with this command.
Configuring the hello multiplier for calculating the adjacency hold time
Adjacency hold time sets how long one edge device can retain the adjacency with another edge device.
It determines how long it takes for an edge device to detect a failed EVI link.
If the Graceful Restart function is disabled, the adjacency hold time equals the EVI IS-IS hello interval
multiplied by the hello multiplier set in this section.
If Graceful Restart is enabled, the adjacency hold time equals the restart interval or the EVI IS-IS hello
interval multiplied by the hello multiplier, whichever is greater.
An edge device sends its adjacency hold time in hello packets to update the adjacencies with its
neighbor edge devices. A neighbor edge device removes the adjacency with the advertising edge
device and recalculates routes if it does not receive an EVI IS-IS hello packet from the advertising edge
device before the time value expires.
To configure the multiplier for calculating the adjacency hold time on an EVI tunnel interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter EVI tunnel interface
view. interface tunnel number [ mode
evi ]
N/A
3. Configure the multiplier for
calculating the adjacency
hold time.
evi isis timer holding-multiplier
value
The default multiplier is 3.
The maximum adjacency hold time is
65535 seconds. If this value is exceeded,
the actual adjacency hold time is set to
65535 seconds.
Configuring the DED priority
The edge devices on an EVI link exchange their DED priority in EVI IS-IS hello packets to elect the inter-site
DED for periodic LSDB synchronization. You can use the evi isis timer csnp command to change the
synchronization interval.
The edge device with higher DED priority is more likely to be elected as an inter-site DED. If two edge
devices have the same DED priority, the device with the highest MAC address is elected.
To configure the DED priority of the edge device on an EVI tunnel interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter EVI tunnel interface view.
interface tunnel number
[ mode evi ]
N/A
3. Configure the DED priority. evi isis ded-priority value The default DED priority is 64.