ramd.conf.4 (2010 09)

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ramd.conf(4) ramd.conf(4)
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IS-IS SECTION OF THE CONFIGURATION FILE
The following describes the IS-IS section of the RAMD configuration file.
IS-IS Protocal Overview
IS-IS is a link state interior gateway protocol (IGP), or Intra-Domain Routing Protocol, originally
developed for routing ISO/CLNP (International Organization for Standardization/Connectionless Network
Protocol) packets. IS-IS of RAMD supports IPv6 Routing information exchange. It transmits over data
link layer. The key features of the IS-IS protocol are as follows:
• The IS-IS supports two-level routing hierarchy. Routing within an area is Level 1 routing and across
areas is Level 2 routing.
• The IS-IS routers become neighbors if the hello packets contain information that meets the criteria for
forming an adjacency. The criteria differ depending on the type of media used. The main criteria are
matching authentication, IS-type and Maximum Transmission Unit (MTU) size.
• The IS-IS builds Link-State Packet (LSP) that communicates the reachability information to adjacent
routers. Floods LSPs to all adjacent neighbors except the interface on which they received the LSP.
IS-IS uses Shortest Path Algorithm (SPF), also known as Djikstra algorithm, to compute its routing
table by selecting the best paths in the network. SPF runs individually for Level 1 and Level 2 data-
base.
• The IS-IS runs as a daemon process. IS-IS can be configured using the IS-IS protocol section of the
RAMD configuration file,
/etc/ramd.conf
.
• The IS-IS routers provide the best path to
ramd for updating the kernel routing table.
Enabling IS-IS
The RAMD configuration file enables or disables the IS-IS protocol. If the IS-IS section is not specified in
the configuration file, by default, IS-IS is
off.
isis (on|off) {admin(up|down); [snmp (on
|off) ;]};
where:
isis Enables or disables IS-IS protocol. By default, IS-IS protocol is disabled.
admin Specifies the administrative status of the IS-IS protocol. By default, administrative status is
up.
snmp Enables or disables SNMP support in isisd. When on is specified, isisd
subagent regis-
ters with the snmpdm(1M) master agent and accesses the SNMP operations like
GET, SET,
and
GET-NEXT. isisd supports enterprise-specific MIB based on SNMPv2C.
isisd imple-
ments EMANATE subagent. By default,
snmp is off.
Using ram_monitor for IS-IS
ram_monitor can be used to monitor IS-IS. CLI port number can be specified in the IS-IS section in the
RAMD configuration file:
cliport port-number ;
isisd listens for ram_monitor connection. If the CLI port number is not specified, isisd does not
provide CLI service.
System Level for IS-IS
The
level statement in the IS-IS section of the configuration file defines the level of the interface:
level (l1|l2|both);
specifies the IS-IS level of the interface. By default, this value is both.
Maximum Areas for IS-IS
The
maxareaddr statement configures the maximum area address in a system:
maxareaaddr num;
where num specifies the maximum area addresses supported by IS-IS. By default, this value is 3.
20 Hewlett-Packard Company − 20 − HP-UX 11i Version 3: September 2010