RTS DV-3400 Informações Técnicas descarregar pdf (Página 330)

100

101

Port Traffic Controls

All-Traffic Rate-Limiting for the 5300xl, 3400cl and 6400cl Switches

5300xl Switch

5300xl Switch Router

Server

Backup Server

Dormitory 1

Dormitory 2

Dormitory 3

Dormitory 4

Administration

Building

Classroom

WAN

LAN

ICMP Rate-Limit

at 1%

ICMP Rate-Limit

at 1%

ICMP Rate-Limit

at 5%

Figure 14-3. Example of ICMP Rate-Limiting

ICMP Rate-Limiting Operation. ICMP rate-limiting operates on an inter-

face (per-port or per-trunk) basis to allow, on average, the highest expected

amount of legitimate, inbound ICMP traffic. For example, if a 100 Mbps port

negotiates a link to another switch at 100 Mbps and is ICMP rate-limit config-

ured at 5%, then the inbound ICMP traffic flow through that port is limited to

5 Mbps. Similarly, if the same port negotiates a 10 Mbps link, then it allows 0.5

Mbps of inbound traffic. (For more on performance under varying operating

conditions, refer to “Operating Notes for ICMP Rate-Limiting” on page 14-17.)

If an interface experiences an inbound flow of ICMP traffic in excess of its

configured limit, the switch generates a log message and an SNMP trap (if an

SNMP trap receiver is configured).

Applying ICMP Rate-Limiting to a Port Trunk. These rules apply to

ICMP rate-limiting when applied to a trunk:

■ The configured ICMP traffic limit is applied as a percentage of all traffic

inbound on the trunk.

■ ICMP rate-limiting is only supported on a port trunk where all members

of the trunk are in the same module slot. ICMP rate-limiting is not

supported on trunks having members in multiple module slots.

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