IBM 8265 Nways ATM Switch, Описание продукта

Страница: 21 / 100

Chapter 1. Introduction
7
•
Traffic shaping per Virtual Path:
Traffic shaping regulates traffic to a lower rate than the line speed, and is active
for incoming and outgoing traffic. The control at the Virtual Path (VP) level means
that the 8265 can have different shaping values for different VPs that are active
on the same port. Each of these VPs may have a different end user address.
•
Counters:
– Per connection:
•
number of valid cells received
•
number of valid cells received discarded due to policing or UBR
•
number of valid cells transmitted
•
number of valid cells transmitted and discarded due to congestion.
The counters can be enabled either manually for a specific connection, or
automatically for all connections (in this mode, there is a limitation of 4000
connections per module).
– Per port:
•
number of unknown Virtual Path Identifiers and Virtual Channel Identifiers
•
number of Available Bit Rate (ABR) RM cells with invalid CRCs.
– Per module:
•
number of cells transmitted to the Control Point.
•
Buffering:
The 8265 modules are equipped with input and output buffer queues, combining
the benefits of the two queueing methods:
– The output buffering helps to improve the link utilization when temporary
traffics bursts occur, and delays the implementation of flow control on the
traffic. In addition, it allows the shaping of traffic, down at the VP level, with a
fine granularity.
– The input buffering with the reshaping function reduces the burstiness of the
traffic in the network, and minimizes the likelihood of contention within the
8265 or the network. By exercising backpressure inside the 8265, traffic can
be held at the input buffer in various modules without significantly increasing
the size of the output buffer.
•
Port mirroring (snooping):
This function duplicates and redirects traffic flow to a designated port. This allows
traffic analysis by connecting a Traffic Analyzer to the port. Multiple mirrored
ports can be active at the same time. When a port is used to redirect traffic from
other port(s), the other ports on the same module are disabled.
Managing Code Updates
The following operations can be performed either inband using RFC1577 or LAN
emulation client, or out-of-band using the Ethernet port or Serial Line Interface
Protocol (SLIP) on the RS-232 port:
•
Microcode can be downloaded using TFTP for update
•
FPGA can be downloaded using TFTP for update
•
Configuration data can be uploaded and downloaded using TFTP
•
Error log, traces, and dumps can be uploaded for debugging
•
Telnet and PING operations.