AIX Version 4.3 Differences Guide

Gated collects the routing information from each protocol and then selects the
best route per destination among them. Each routing protocol has its own way of
calculating the cost of a route, that is, the metric value of a route. For example,
RIP uses distance (hop count) and HELLO uses time (delay in milliseconds) to
determine the cost of a route. Gated uses its own preference values to determine
who has the best route. Preference values range from 0-255 with lower numbers
indicating more preferred routes. Once gated has selected its best route to a
destination, it puts that route in its routing table and later installs it into the
kernel’s routing table.
There are three new commands delivered along with the new gated supporting
IPv6 routing. They are gdc, ospf_monitor, and ripquery.
Following are some brief descriptions of these new introduced commands:
7.6.1.1 gdc Command
The gdc command provides an operational user interface for gated. The interface
is user-oriented for the operation of the gated routing daemon. It provides
supports for:
• Starting and stopping gated daemon
• Delivering signals to manipulate the gated daemon
• Maintenance and syntax checking of configuration files
• Removal of state dumps and core dumps
The gdc command can reliably determine the running state of gated and produces
a reliable exit status when errors occur, making it advantageous for use in shell
scripts that manipulate gated.
7.6.1.2 ospf_monitor Command
The ospf_monitor command queries OSPF routers to provide the detailed
statistics. It monitors the OSPF gateways.
7.6.1.3 ripquery Command
The ripquery command sends a RIP request or POLL command, to a RIP
gateway to request all the routes known by the gateway. It queries the RIP
gateways. This command is used as a tool for debugging gateways.
Gated has the following enhancements:
• SRC support is added to gated. You can start gated using SRC or gdc.
• Message catalog is added for gated, ripquery, ospf_monitor, and gdc.
Following IPv6 protocols are added in gated:
• IPv6 Routing Information Protocol (RIPNG)
• IPv6 Internet Control Message Protocol (ICMPv6)
• IPv6 Border Gateway Protocol (BGP4+)
7.6.2 IPv6 Routing Functions
The changes for IPv6 routing in Institut National de Recherche en Informatique et
en Automatique (INRIA) are merged into the AIX netinet and kernel. Also, some
Networking Enhancements 169