Cisco 11503 - CSS Content Services Switch Spécifications télécharger pdf (Page 155)

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Cisco Content Services Switch Routing and Bridging Configuration Guide

OL-8241-02

Chapter 6 Configuring the Internet Protocol

Configuring IP Equal-Cost Multipath

To set the equal-cost multipath (ECMP) selection algorithm and the preferred

reverse egress path, use the ip ecmp command. The CSS supports a maximum of

15 ECMP paths.

The syntax for this global configuration command is:

ip ecmp [address|no-prefer-ingress|roundrobin]

The options for this global configuration mode command are as follows:

• address - Choose among alternate paths based on IP addresses. For example:

(config)# ip ecmp address

• no-prefer-ingress - Do not prefer the ingress path of a flow for its reverse

egress path. By default, the ingress path for a flow is the preferred egress path.

This means that the preferred interface over which to reply to a client is the

interface on which the CSS originally received the request from the client.

Note that this command option has no effect on UDP traffic.

For example:

(config)# ip ecmp no-prefer-ingress

To reset the ingress path of a flow for its preferred reverse egress path, enter:

(config)# no ip ecmp no-prefer-ingress

• roundrobin - Alternate between equal paths in roundrobin fashion. For

example:

(config)# ip ecmp roundrobin

Note The CSS applies the ECMP selection algorithm for non-TCP/UDP packets (for

example, ICMP) on a packet-by-packet basis. Multipath selection for TCP and

UDP is performed on a per-flow basis, and all packets for a particular flow take

the same path.

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Cisco 11503 - CSS Content Services Switch Spécifications Page 155