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Introduction to the BayStack 410-24T Switch

309985-B Rev 00

1-57

IEEE 802.1p Prioritizing

You can use the VLAN Configuration screens to prioritize the order in which the

switch forwards packets, on a per-port basis. For example, if messages from a

specific segment are crucial to your operation, you can set the switch port

connected to that segment to a higher priority level (by default, all switch ports are

set to Low priority). Untagged packets received by the switch on that port are

tagged according to the priority level you assign to the port (see Figure 1-34

Figure 1-34. Prioritizing Packets

The newly tagged frame is read within the switch and sent to the port’s high or low

transmit queue for disposition (see Figure 1-35

). The port transmit queue example

shown in Figure 1-35

applies to all ports on the BayStack 410-24T switch.

BS41029A

Port 6 Port 7 Port 8

Port 1

PVID = 2

Priority = 6

Port 4

Port 5

Port 2 Port 3

802.1Q Switch

High

Low

Key

Priority

CFI

VID

- User_priority

- Canonical format indicator

- VLAN identifier

Tagged member

of VLAN 2 (Port 5)

Port configuration

parameters

Port 5

transmit

queue

Untagged member

of VLAN 2

After

Before

Data

CRC

(*Recalculated)

Outgoing

untagged packet

(unchanged)

Data

CRC

DASADataCRC* Tag

VID = 2Priority = 6

16 bits 3 bits 1 bit 12 bits

8100 CFI

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 309 310

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