H3C Technologies H3C SR8800 - Manual (Page 176)

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Step Command Remarks
3. Specify a DIS priority for the
interface. isis dis-priority value [ level-1 |
level-2 ] Optional
64 by default
Disabling an interface from sending/receiving IS-IS packets
After disabled from sending and receiving hello packets, an interface cannot form any neighbor
relationship, but can advertise directly connected networks in LSPs through other interfaces. This can save
bandwidth and CPU resources, and ensures other routers know networks directly connected to the
interface.
To disable an interface from sending and receiving IS-IS packets:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Disable the interface from
sending and receiving IS-IS
packets. isis silent Not disabled by default
Disabling hello source address check for a PPP interface
On a P2P link, IS-IS verifies the source IP address of the incoming hello packets is in the same network
segment as the IP address of the receiving interface. If not, it discards the hello packets, and no neighbor
relationship can be established with the peer router.
For a PPP interface, the peer’s IP address may reside on a different network segment. In this case, you can
disable the hello source address check for the PPP interface to establish the neighbor relationship with the
peer.
To enable neighbor relationships over different network segments:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Disable hello source
address check for the PPP
interface. isis peer-ip-ignore
The command only applies to the PPP
interface.
By default, hello source address check
is enabled.
Enabling an interface to send small hello packets
IS-IS messages cannot be fragmented at the IP layer because they are directly encapsulated into frames.
Any two IS-IS neighboring routers must negotiate a common MTU. To avoid sending big hellos for saving
bandwidth, enable the interface to send small hello packets without CLVs.