Huawei Quidway NetEngine80E Configuration Manual page 526

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
l
Dynamic Host Name Exchange Mechanism
The dynamic host name exchange mechanism is introduced to conveniently manage and
maintain IS-IS networks. The mechanism provides a service of mapping host names to system
IDs for the IS-IS devices. The dynamic host name information is advertised in the form of a
dynamic host name TLV in an LSP.
The dynamic host name exchange mechanism also provides a service to associate a host name
with the designated intermediate system (DIS) on a broadcast network. Then LSPs of pseudo
nodes advertise this association in the form of a dynamic host name TLV.
It is easier to identify and memorize the host name than the system ID. After this function is
configured, the host name will display when display command is used.
IS-IS Route Summarization
Route summarization is a function for summarizing routes with the same IP prefix into one route.
On a large-scale IS-IS network, you can configure route summarization to reduce the number
of IS-IS routes in the routing table. This improves the usage of system resources and facilitates
route management.
IP network segments are not affected when a link frequently alternates between Up and Down
on an IP network segment. This prevents route flapping and improves the network stability.
The router supports classless network-based route summarization.
IS-IS Load Balancing
If there are redundant links on an IS-IS network, there may be multiple equal-cost routes.
Configuring IS-IS load balancing can evenly distribute traffic to each link. This increases the
bandwidth usage of each link and prevents network congestion caused by some overloaded links.
IS-IS load balancing, however, may affect traffic management because traffic will be randomly
forwarded in this mode.
Issue 02 (2014-09-30)
It is a virtual system for generating extended LSP fragments. Each virtual system has a
unique additional system ID, and each extended LSP fragment carries an additional
system ID.
Operating mode
An IS-IS device can run the LSP fragment extension feature in the following modes:
– Mode 1: The originating system sends a link to each virtual system. Then each virtual
system sends a link to the originating system. The virtual systems function as the
routers that are connected to the originating system on the network. This mode is used
when some routers on the network do not support the LSP fragment extension feature.
In this mode, only the routing information can be advertised in the LSPs of the virtual
systems.
– Mode 2: All the routers on the network can learn that the LSPs generated by the virtual
systems actually belong to the originating system. This mode is used when all the
routers on the network support the LSP fragment extension feature. In this mode, all
link state information can be advertised in the LSPs of the virtual systems.
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
7 IS-IS Configuration
501