Cisco SCE 1000 2xGBE User's Guide download pdf (Page 200)

Chapter 7 Line Configuration

Configuring Traffic Rules and Counters

SCE 1000 2xGBE Release 2.0.10 User Guide

7-6 OL-7117-02

Traffic Rules

A traffic rule specifies that a defined action should be taken on packets processed by the SCE

Platform that meet certain criteria. The maximum number of rules is 128. Each rule is given a

name when it is defined, which is then used when referring to the rule.

Packets are selected according to user-defined criteria, which may be any combination of the

following:

• IP address: A single address or a subnet range can be specified for each of the line ports

(Subscriber / Network).

• Protocol: TCP/UCP/ICMP/IGRP/EIGRP/IS-IS/OSPF/Other

• TCP/UDP Ports: A single port or a port range can be specified for each of the line ports

(Subscriber / Network). Valid for the TCP/UDP protocols only.

• TCP flags (TCP only).

• Direction (Upstream/Downstream).

The possible actions are:

• Count the packet by a specific traffic counter

• Block the packet (do not pass it to the other side)

• Ignore the packet (do not provide service for this packet: No bandwidth metering, transaction

reporting etc. is done)

Block and Ignore actions affect only packets that are not part of an existing flow.

Note that Block and Ignore are mutually exclusive. However, blocked or ignored packets can also

be counted.

It is possible for a single packet to match more that one rule (The simplest way to cause this is to

configure two identical rules with different names). When this happens, the system operates as

follows:

• Any counter counts a specific packet only once. This means that:

• If two rules specify that the packet should be counted by the same counter, it is counted

only once.

• If two rules specify that the packet should be counted by different counters, it is counted

twice, once by each counter.

• Block takes precedence over Ignore: If one rule specifies Block, and another rule specifies

Ignore, the packet is blocked.

Traffic counters

Traffic counters count the traffic as specified by the traffic rules. The maximum number of

counters is 32. Each counter is given a name when it is defined, which is then used when referring

to the counter.

A traffic counter can be configured in one of two ways:

• Count packets: the counter is incremented by 1 for each packet it counts.

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Cisco SCE 1000 2xGBE User's Guide Page 200