High availability
Configuration guidelines
This section provides important information about configuring UFD:
•UFD is required only when
•Only one Failure Detection pair (one group of Links to Monitor and one group of Links to Disable) is supported on each switch (all VLANs and Spanning Tree Groups).
•An LtM can be either one uplink port or one
•Ports that are already members of a trunk group are not allowed to be assigned to an LtM.
•A trunk group configured as an LtM can contain multiple uplink ports
•An uplink port cannot be added to a trunk group if it already belongs to an LtM.
•An LtD can contain one or more ports, and/or one or more trunks
•A trunk group configured as an LtD can contain multiple downlink ports
Monitoring Uplink Failure Detection
The UFD information menu displays the current status of the LtM and LtD, and their member ports or trunks. For example:
>> Information# ufd |
|
| |
Uplink Failure Detection: Enabled |
| ||
LtM status: Down |
|
| |
Member | STG | STG State | Link Status |
port 19 |
|
| down |
1DISABLED
10DISABLED *
15DISABLED *
*= STP turned off for this port.
LtD status: Auto Disabled
Member |
| Link Status |
port | 1 | disabled |
port | 2 | disabled |
port | 3 | disabled |
port | 4 | disabled |
Use the /stats/ufd command to find out how many times link failure was detected on the LtM, how many times Spanning Tree blocking state was detected on the LtM, and how many times UFD disabled ports in the LtD.
Configuring Uplink Failure Detection
The preceding figure shows a basic UFD configuration. Assume that port 19 on Blade Switch 1 is connected to a Layer 2/3 routing switch outside of the chassis. Port 18 and port 19 on Blade Switch 2 form a trunk that is connected to a different Layer 2/3 routing switch.
In this example, NIC 1 is the primary network adapter; NIC 2, NIC 3, and NIC 4 are
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