IBM 8275, User Manual

Page: 59 / 110

each Ethernet port is an interface and so is the IP Agent being used for
managing it (which is also referred to as the Management Interface).
v
The value returned for ifNumber in the MIB-II Interface table does not
include the Management Interface (that is, the value of ifNumber only
reflects the number of ports in the switch). If there are 32 ports, ifNumber
will incorrectly be 32 instead of being 33.
v
Port ifIndex Values - The ifIndex values for the 8275-416 ports start with
1 and increment by 1 for each port physically in the box. Each ifIndex
value maps, one for one, with an Ethernet port.
v
Example scenarios:
– if there are 32 ports (16 base ports, 8 ports in slot 1, 8 ports in slot 2)
- ifIndex 1 is slot 0, port1
- ifIndex 9 is slot 0, port 9
- ifIndex 17 is slot 1, port 1
- ifIndex 25 is slot 2, port 1
– if there are 24 ports (16 base ports, 8 ports in slot 2)
- ifIndex 1 is slot 0, port1
- ifIndex 9 is slot 0, port 9
- ifIndex 17 is slot 2, port 1
The Management Interface always has an ifIndex of 1000.
Port MAC Address
Each port is automatically configured with a burned-in MAC address. This
address is used as the source address of spanning tree frames and may be
used in 802.3x PAUSE frames for the 8275-416 .
Configuring Port Monitoring
Any of the Ethernet ports can be selected as a probe to monitor forwarded traffic
(not local traffic) with an external network analyzer. The selected probe port can
monitor (mirror) traffic from one port.
From the Main Menu, select Device Configuration Menu. Then, select Port
Monitoring Menu from the Device Configuration Menu. (See Figure 31 on
page 46.)
Chapter 4. Using the Terminal Interface
45