H3C Technologies H3C S12500 Series Switches - Manual (Page 21)

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If the EVI tunnel interface has been deleted, the undo evi-isis command deletes the EVI IS-IS process and
clears the settings made in EVI IS-IS process view. If the EVI tunnel interface still exists, the undo evi-isis
command only clears the settings made in EVI IS-IS process view.
To create an EVI IS-IS process or enter its view:
Step Command Remarks
1. Enter system view. system-view N/A
2. Create an EVI IS-IS process and enter
EVI IS-IS view.
evi-isis process-id
By default, no EVI IS-IS process is
configured.
Optimizing an EVI IS-IS network
Perform the tasks in this section to optimize an EVI IS-IS network for bandwidth efficiency and high
performance.
Configuring the EVI IS-IS hello interval
EVI edge devices send EVI IS-IS hellos over EVI links to establish and maintain adjacencies, and elect the
DED on each EVI link.
A short interval increases the speed of network convergence but requires more system resources.
To configure the EVI IS-IS hello interval on an EVI tunnel interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter tunnel interface view.
interface tunnel number
[ mode evi ]
N/A
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 the DED on
an EVI link, its hello interval on
the link 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 retains the adjacency with another. It determines
how long an edge device can 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.
NOTE:
The hello interval of a DED is one-third of the hello interval set with the evi-isis timer hello command.
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