Avaya Using Technician Interface Software Uživatelský manuál stáhnout pdf (Strana 222)

Using Technician Interface Software

8-70

Unlike the show ip script command, which retrieves from the router’s active MIB

an aggregated view of data from IP routing tables and internal caches across all

slots, the Technician Interface

ip command retrieves the contents of the routing

table on a single slot that you specify. For this reason, the

ip command retrieves

information signiﬁcantly faster than the

show ip command.

With the

ip command, you can examine

• The entire contents of the routing table on any slot

• A subset of the total contents of the routing table on any slot

You limit the view of a routing table by applying ﬁlters — subcommand options

and ﬂags — to the

ip command syntax. For example, you can enter ip routes

<s>

, where -

<s>

is a slot number you specify.

Interface Cache

The router operating system allocates a cache storage space to each protocol-

speciﬁc logical interface that you deﬁne on any physical circuit of the router. The

interface cache stores routing information relevant only to itself and its own view

of the networks external to the router.

This cache provides an initial source for an interface to retrieve at high speed the

best routes to any other IP destination address in your network. Upon receiving a

packet, the interface checks its local cache, then speciﬁes processing for the

packet:

• Encaps processing— The packet will be forwarded out of the interface.

• Reassembly processing — The packet is for this router.

• Redirect processing — An ICMP Redirect packet will be sent from the

interface, back to the source.

• Net Unreachable processing — An ICMP Net Unreachable packet will be sent

from the interface, back to the source.

• Host Unreachable processing — An ICMP Host Unreachable packet will be

sent from the interface, back to the source.

Note: RIP and EGP routes are refreshed only on a slot that receives a routes

update. Route ages may be different on each slot for this reason.

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Avaya Using Technician Interface Software Uživatelský manuál Strana 222