11.4 Routing Functions

The Multiprotocol Interconnect module supports the following routing protocols:

IP

IPX

DECnet Phase IV

11.4.1IP Routing Support

When acting as an IP router, the Multiprotocol Interconnect module provides support for:

Directed broadcast

ICMP

Proxy ARP

Ethernet or 802.3 (not both) encapsulation on LAN interface

Datagram fragmentation/reassembly support

IP security

Boothelper

Static routes

Dynamic routes

RIP

OSPF

11.4.1.1 RIP Implementation

The following is a summary of the RIP implementation in the Multiprotocol

Interconnect module:

Routing messages are broadcast every 30 seconds.

Triggered updates are sent.

Split horizon with poison reverseis always used.

Host level routing is supported (with future WAN I/O cards).

RIP can be enabled/disabled on a per logical port basis.

RIP can be enabled/disabled globally.

Path cost can be configured on each logical port.

Routing table entries are aged-out to ensure validity of routes.

Can pass or block datagrams according to user defined security access list.

11.4.1.2 OSPF Implementation

The following is a summary of the OSPF implementation in the Multiprotocol

Interconnect module:

Only topology changes are broadcast as per OSPF Specification Version 2 (RFC 1247).

Supports alternate routes based on IP Type Of Service (TOS).

Supports multiple paths with equal costs.

Chapter 11. 8260 Multiprotocol Interconnect Module 245

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IBM 8260 manual Routing Functions, IP Routing Support, RIP Implementation, Ospf Implementation, ∙ DECnet Phase

8260 specifications

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