Specifications

Summary of Features

ExtremeWare XOS 11.0 Concepts Guide 23

sFlow



is a technology for monitoring traffic in data networks containing switches and routers. The

technology relies on statistical sampling of packets from high-speed networks, plus periodic gathering

of the statistics. A UDP datagram format is defined to send the information to an external entity for

analysis. sFlow consists of a Management Information Base (MIB) and a specification of the packet

format for forwarding information to a remote agent. Details of sFlow specifications can be found in

RFC 3176, and specifications and more information can be found at the following website:

http://www.sflow.org

The ExtremeWare XOS implementation is based on sFlow version 5, an improvement from that

specified in RFC3176.

For information on sFlow, see Chapter 9.

Unicast Routing

The switch routes IP traffic between the VLANs that are configured as virtual router interfaces. Both

dynamic and static IP routes are maintained in the routing table. The following routing protocols are

supported:

• RIP version 1

• RIP version 2

• OSPF version 2

• BGP version 4

For more information on IP unicast routing, see Chapter 15. For more information on RIP, see

Chapter 16.

ESRP

With software version 11.0, you can use the Extreme Standby Routing Protocol (ESRP). ESRP is an

Extreme Networks proprietary protocol that allows multiple switches to provide redundant routing

services to users. ESRP also provides Layer 2 redundancy; the Layer 3 and Layer 2 redundancy can be

used separately or together.

Using ESRP allows you to simplify your network, and it works very well in meshed networks where

Layer 2 loop protection and Layer 3 redundancy are both required.

For more information on ESRP, see Chapter 13.

IP Multinetting

Software version 11.0 of ExtremeWare XOS introduces IP multinetting, which allows you to overlap

multiple subnets onto the same physical segment. IP multinetting is designed for use in legacy

networks, as a transitional tactic.

For more information on IP multinetting, see Chapter 15.