H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches Chapter 4 IS-IS Configuration
4-15
CLV Code Name PDU Type
9 LSP Entries SNP
10 Authentication Information IIH, LSP, SNP
128 IP Internal Reachability Information LSP
129 Protocols Supported IIH, LSP
130 IP External Reachability Information L2 LSP
131 Inter-Domain Routing Protocol Information L2 LSP
132 IP Interface Address IIH, LSP
Code 1 to 10 of CLV are defined in ISO 10589 (code 3 and 5 are not shown in the table),
and others are defined in RFC 1195.
4.1.5 IS-IS Features Supported
I. Multiple processes
IS-IS supports multiple processes. Multiple processes allow a designated IS-IS process
to work in concert with a group of interfaces. This means that a router can run multiple
IS-IS processes, and each process corresponds to a unique group of interfaces.
II. Hot standby
 Note:
For detailed information about IS-IS hot standby, refer to HA Configuration.
A distributed router supports IS-IS Hot Standby (HSB) function. The data are copied
from the Active Main Board (AMB) to the Standby Main Board (SMB). Whenever the
AMB is down, the SMB can switch to the active status to maintain IS-IS normal
operation.
III. Management tag
Management tag carries the management information of the IP address prefixes and
BGP community attribute. It controls the redistribution from other routing protocols.
IV. LSP fragment extension
IS-IS advertises link state information by flooding LSPs. One LSP carries limited
amount of link state information; therefore, IS-IS fragments LSPs. Each LSP fragment
is uniquely identified by a combination of the System ID, Pseudonode ID (0 for a