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Is it possible to config UCS STP priority in "Switch mode" ?

I want to config STP Priority for UCS in Switch mode (Default is 32768 + VLANID).

How can I do that ? please advice.

Thank you

1 ACCEPTED SOLUTION

Accepted Solutions
Daniel Laden
Enthusiast

Connectivity Solutions for the Cisco Unified Computing System

http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9402/white_paper_c11-623265.html

• You cannot configure Spanning Tree Protocol parameters, such as bridge priority and hello timers.

Ethernet Switching Mode

The Ethernet switching mode determines the way that the fabric interconnect behaves as a switching device between the servers and the network. The fabric interconnect operates in either of the following Ethernet switching modes:

• Switch mode

• End-Host Mode

Switch Mode

Switch mode is the traditional Ethernet switching mode. Use switch mode when the fabric interconnect is directly connected to a router, or when Layer 3 aggregation or a VLAN in a box is used upstream (Figure 32). Switch mode has the following attributes:

• The fabric interconnects run Spanning Tree Protocol with connected external switches to avoid forwarding loops; broadcast and multicast packets are handled in the traditional way.

• The fabric interconnects run Per-VLAN Spanning Tree Plus (PVST+), which cannot be changed to another Spanning Tree Protocol such as Multiple Spanning Tree (MST).

• You cannot configure Spanning Tree Protocol parameters, such as bridge priority and hello timers.

• MAC address learning and aging are enabled on both the server links and the uplinks, so that the switch operates like a typical Layer 2 switch.

• Some uplinks connected to external switches may be blocked by spanning-tree rules.

Also remember that you are limited to the options presented to you via the CLI and GUI.  They should have the same capabilities.  If you do not see an option for configuring spantree priortiy, changing the value is not supported.

HTH,

Dan Laden

View solution in original post

3 REPLIES 3
Daniel Laden
Enthusiast

Connectivity Solutions for the Cisco Unified Computing System

http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9402/white_paper_c11-623265.html

• You cannot configure Spanning Tree Protocol parameters, such as bridge priority and hello timers.

Ethernet Switching Mode

The Ethernet switching mode determines the way that the fabric interconnect behaves as a switching device between the servers and the network. The fabric interconnect operates in either of the following Ethernet switching modes:

• Switch mode

• End-Host Mode

Switch Mode

Switch mode is the traditional Ethernet switching mode. Use switch mode when the fabric interconnect is directly connected to a router, or when Layer 3 aggregation or a VLAN in a box is used upstream (Figure 32). Switch mode has the following attributes:

• The fabric interconnects run Spanning Tree Protocol with connected external switches to avoid forwarding loops; broadcast and multicast packets are handled in the traditional way.

• The fabric interconnects run Per-VLAN Spanning Tree Plus (PVST+), which cannot be changed to another Spanning Tree Protocol such as Multiple Spanning Tree (MST).

• You cannot configure Spanning Tree Protocol parameters, such as bridge priority and hello timers.

• MAC address learning and aging are enabled on both the server links and the uplinks, so that the switch operates like a typical Layer 2 switch.

• Some uplinks connected to external switches may be blocked by spanning-tree rules.

Also remember that you are limited to the options presented to you via the CLI and GUI.  They should have the same capabilities.  If you do not see an option for configuring spantree priortiy, changing the value is not supported.

HTH,

Dan Laden

View solution in original post

So I need to config root from another point of the network.

I got it.

Thank you

Yes in a recent release ability for FI to be root was removed so it cannot happen as its causing sub-optimal paths when UCS is deployed as recommended.

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