Operation Manual – IPv4 Routing
H3C S3610&S5510 Series Ethernet Switches
Chapter 4 IS-IS Configuration
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4.5.11 Enabling an Interface to Send Small Hello Packets
Follow these steps to enable an interface to send small hello packets (without the
padding field):
To do…
Use the command…
Remarks
Enter system view
system-view
––
Enter interface view
interface
interface-type
interface-number
––
Enable the interface to send
small hello packets that have no
padding field
isis small-hello
Required
Standard hello
packets are sent by
default.
4.5.12 Enabling SNMP Trap
Follow these steps to enable IS-IS trap:
To do…
Use the command…
Remarks
Enter system view
system-view
––
Enter IS-IS view
isis
[
process-id
] [
vpn-instance
vpn-instance-name
]
––
Enable SNMP Trap
is-snmp-traps enable
Required
Enabled by default
4.6 Configuring IS-IS GR
An ISIS restart may cause the termination of the adjacencies between a restarting
router and its neighbors, resulting in a transient network disconnection.
IS-IS Graceful Restart can help to solve this problem by notifying its neighbors its
restarting state to allow them to reestablish the adjacency without removing it. The
IS-IS Graceful Restart provides the following features:
z
When restarting ISIS, a Graceful Restart capable device will resend connection
requests to its neighbors instead of terminating their neighboring relationships.
z
Graceful Restart minimizes network disruption caused by LSDB synchronization
before LSP packets generation.
z
When a router starts for the first time, it sets the overload bit in LSP packets before
LSDB synchronization is complete, which ensures no routing loop is created.