Pros And Cons Of Different Ip Addressing Schemes; Routing Considerations For Ip Multiplexing - Avaya 1000 Series Configuration Manual

IP MULTIPLEXING OVERVIEW
Router/DSU

Pros and Cons of Different IP Addressing Schemes

The following table provides information about addressing scheme pros and cons.
Table 18: Addressing Schemes: Pros and Cons
Approach
Single Subnet
Split Subnet
Secondary
Addressing

Routing Considerations for IP Multiplexing

• RIP/RIP2/IGRP – Turn off split horizons to enable routing updates through secondary
addresses, if used.
• EIGRP – Updates are sourced only from primary addresses, although routers will listen
to updates arriving on primary and secondary.
• OSPF – For Cisco-compatible and other routers, routing updates are sourced and
detected only on primary addresses, therefore secondary addressing schemes are not
usable.
• BGP4 – Routing updates are fully functional over primary and secondary addresses.
86 Avaya Secure Router 1000 Series Configuration Guide
s0:
Pros
Minimizes consumption of
IP address space
Less routes required in
Avaya
Easily Scalable
199.1.1.19/29
Cons
POP Avaya requires two route statements
per remote connection.
Consumes 29-bit subnet per remote site.
Consumes 29- or 30-bit subnet per remote.
Not transparent to certain routing protocols.
December 2010