IBM 8275-416, User Manual

Page: 66 / 156

Admin Mode
This is a configurable value and indicates if the port is enabled or disabled.
The default for all ports is Enabled.
Physical Mode
This is a configurable value and indicates the speed and duplex setting for
the port. The value of Auto (autodetect) is valid only for 10/100BASE-TX
ports.
v
Auto: automatically negotiates the speed and duplex setting
v
100 Half: 100BASE-T half-duplex
v
100 Full: 100BASE-T full duplex
v
10 Half: 10BASE-T half duplex
v
10 Full: 100BASE-T full duplex
v
100FX Half: 100BASE-FX half duplex
v
100FX Full: 100BASE-FX full duplex
v
1000SX Full: 1000BASE-SX full duplex
Physical Status
Indicates the port speed and duplex. This is a read-only field.
Link Status
Indicates if the port link is up or down. This is a read-only field.
Link Trap
This is a configurable value and can be Enabled or Disabled. It allows you
to enable or disable link status traps by port. This parameter is only valid
when Link Up/Down Flag is enabled on the Trap Flags Configuration Menu.
IfIndex
This is a read-only field. When using SNMP, the interface index (ifIndex) is
used to identify the specific interface being addressed. The ifIndex is
determined by MIB II.
Configuring port monitoring
You can select any of the Ethernet ports 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. The selected probe port also receives and transmits
network traffic (tagged frames) which allows a device connected to the probe port to
be managed over the network (in-band connectivity). However, the device must be
802.1Q aware to be remotely managed by the switch.
The monitoring port forwards frames with a VLAN membership which matches the
monitored port. The monitoring port transmits all frames as tagged. The monitoring
port does not participate in Spanning Tree Protocol (STP) and is always in a
forwarding state when the link is up. The monitoring port does not forward local
traffic, and it does not participate in GVRP.
Port Monitoring Operation
1. The monitoring port transmits all frames as tagged; therefore, a network
analyzer is remotely manageable only if it is 802.1Q-aware.
2. The monitoring port is unable to transmit frames outside of its VLAN
membership. Therefore, if the monitored port has ingress filtering disabled, any
frames received or forwarded on that port, and which are not affiliated with a
VLAN with which the monitored port is a member, will not be transmitted out of
the monitoring port.
3. The monitoring port always transmits frames with the NCFI bit set. Therefore,
frames not transmitted not on the monitored port due to untagging and a set
NCFI bit cannot be detected and filtered by the monitoring port. In this case, the
50
8275-416 User’s Guide