Avaya Configuring XNS Services User Manual download pdf (Page 26)

Configuring XNS Services

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To limit trafﬁc, RIP broadcasts are limited to a router’s immediate segments and

are not forwarded by receiving routers.

You can enable RIP Listen and RIP Supply functions for each XNS and/or XNS

interface on the router running XNS software. When you enable the Listen

function, the router adds routes received in RIP updates from neighboring routers

to its own internal routing table. When you enable the Supply function, the router

running XNS software transmits RIP updates to routers on neighboring networks.

Error Protocol

The Error Protocol is an optional Level 2 protocol intended to provide diagnostic

and performance information.

The destination host that detects an error returns an Error Protocol packet to the

socket of the host that generated the incorrect packet. The Error Protocol packet

contains a copy of the ﬁrst 42 bytes of the incorrect packet so that it can be

validated by the source. The Packet Type ﬁeld of the Error Protocol packet

identiﬁes the error number.

able 1-1 lists the XNS standard Error Protocol numbers. Bay Networks routers

running XNS software report errors they detect using this standard. The host that

detected the error discards the incorrect packet after copying its ﬁrst 42 bytes to

the Data ﬁeld of the Error Protocol packet.

Because the protocol is optional, the host that receives the Error Protocol packet

may or may not use the information before dropping the packet. The Bay

Networks router running XNS software does not use the information in the Error

Protocol packets it receives.

Note: The router running XNS software learns WAN addresses from RIP

broadcasts received over WANs, and therefore stores XNS address/WAN

address pairs for future use as next-hop destinations. So, if RIP is not

conﬁgured for a WAN interface, you must conﬁgure adjacent hosts for all

transmission paths to nodes adjacent to Frame Relay or SMDS circuits when

you conﬁgure an XNS interface. You must then conﬁgure static routes from the

adjacent hosts to the next-hop routers.

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Avaya Configuring XNS Services User Manual Page 26