IBM 8260 manual Routing Functions, IP Routing Support, RIP Implementation, Ospf Implementation

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 reverse″ is 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