HP 445946-001 User Manual download pdf (Page 37)

Ports and trunking

Table 7 Ethernet switch port names

Port number Port alias

13 Downlink13

14 Downlink14

15 Downlink15

16 Downlink16

17 Mgmt

18 Uplink1

19 Uplink2

20 Uplink3

21 Uplink4

Port trunk groups

When using port trunk groups between two switches, you can create an aggregate link operating at up to

forty Gigabits per second, depending on how many physical ports are combined. The switch supports up

to 12 trunk groups per switch, each with up to six ports per trunk group.

The trunking software detects broken trunk links (link down or disabled) and redirects traffic to other trunk

members within that trunk group. You can only use trunking if each link has the same configuration for

speed, flow control, and auto-negotiation.

Statistical load distribution

In a configured trunk group containing more than one port, the load distribution is determined by

information embedded within the data frame. For IP traffic, the switch will calculate the trunk port to

use for forwarding traffic by implementing the load distribution algorithm on value equals to modulus of

(XOR of last 3 bits of Source and last 3 bits of Destination IP address). For non-IP traffic, the switch will

calculate the trunk port to use for forwarding traffic by implementing the load distribution algorithm on

value equals to modulus of (XOR of last 3 bits of Source and last 3 bits of Destination MAC address).

Built-in fault tolerance

Since each trunk group is composed of multiple physical links, the trunk group is inherently fault tolerant.

As long as even one physical link between the switches is available, the trunk remains active.

Statistical load distribution is maintained whenever a link in a trunk group is lost or returned to service.

Before you configure trunks

When you create and enable a trunk, the trunk members (switch ports) take on certain settings necessary

for correct operation of the trunking feature.

Before you configure your trunk, you must consider these settings, along with specific configuration rules,

as follows:

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HP 445946-001 User Manual Page 37