System information

Chapter 2. Functional comparisons

In this chapter, we first talk about features that are pertinent when selecting

Ethernet and ATM switches from different vendors for interworking.

We compare IBM networking hardware feature by feature with alternative

products. As a consequence of the alliance between IBM and Cisco, we

naturally look for Cisco equipment that is similar to and may supplement or

substitute for IBM products. Both IBM and Cisco support industry standards.

There is a multitude of different products that may complement or replace

IBM switches. Customers are encouraged to evaluate aspects other than

sheer interoperability when making an evaluation. But for the purpose of this

redbook we limit the discussion and the comparisons to alternatives that we

believe to be the closest match in functionality to any given existing

equipment.

2.1 Ethernet switches

The following IBM Ethernet switches are considered for interoperability in this

redbook:

• IBM 8271

• IBM 8274

• IBM 8275

• IBM 8277

• IBM 8371

2.1.1 Criteria for comparison

In this section we discuss interoperability of major functions such as:

In many cases, addition or substitution of equipment from a different vendor

is trouble free. In other cases, even if the new equipment has the same or

equivalent functions as the old, interoperability may not be practical.

Cutover migration may be necessary, and design changes to the network

may be required or desirable. This is particularly true when it comes to

advanced functions such as self-learning IP routing or hot

standby/redundant gateways.

Caution