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INS_CWGE24MS2_REV–
10/05/16 PAGE 55
INSTALLATION AND OPERATION MANUAL
CWGE24MS2
TECH SUPPORT: 1.888.678.9427
classes of traffic (voice, video, data, etc.).
›
Canonical Format Indicator (CFI): a 1-bit field. If the value of this field is 1, the MAC address is
in non-canonical format. If the value is 0, the MAC address is in canonical format. It is always
set to zero for Ethernet switches. CFI is used for compatibility between Ethernet and Token
Ring networks. If a frame received at an Ethernet port has a CFI set to 1, then that frame
should not be bridged to an untagged port.
›
VLAN Identifier (VID): a 12-bit field specifying the VLAN to which the frame belongs. A value
of 0 means that the frame doesn’t belong to any VLAN; in this case the 802.1Q tag specifies
only a priority and is referred to as a priority tag. A value of hex 0xFFF is reserved for
implementation use. All other values may be used as VLAN identifiers, allowing up to 4094
VLANs. On bridges, VLAN 1 is often reserved for management.
Priority Levels
PCP: Priority Code Point.
PCP
Network Priority
Traffic Characteristics
1
0 (lowest)
Background
0
1
Best Effort
2
2
Excellent Effort
3
3
Critical Applications
4
4
Video, <100ms latency
5
5
Video, < 10ms latency
6
6
Internetwork Control
7
7 (highest)
Network Control