Oracle Switch ES1-24
 

PLA-Support>Sun Systems>SAND>Network>SN-SND: Sun Network Ethernet Switches
 

In this Document

Symptoms

Changes

Cause

Solution

References

Created from <SR 3-12898099801>

Applies to:

Symptoms

An ES1-24 switch is configured in PVRST mode, Default VLAN ID is 1 .
In this example a port ext 0/6 is configured in trunk mode, pvid 3058, explicit allowed vlans 273,5010-4011 .

Despite this port settings, VLAN 1 appears as allowed and port ext 0/6 is present in the spanning tree configuration for the VLAN 1.
Is there a way to remove ext 0/6 from the VLAN 1 spanning tree (prune VLAN 1) ?

Changes

 When we configure an interface e.g. with

the result in show running-config is

and vlan 1 appears in pvrst spanning tree output.

Cause

The reason for this adding of VLAN 1 is, that it plays a special role here.

The background is similar as described in Cisco's
Spanning Tree Protocol Problems and Related Design Considerations http://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/10556-16.html
"Until recently, there was no way to remove VLAN 1 from a trunk in Cisco implementation. VLAN 1 generally serves as an administrative VLAN, where all switches are accessible in the same IP subnet.
...
As of CatOS version 5.4 and Cisco IOS Software Release 12.1(11b)E, you can remove VLAN 1 from trunks. VLAN 1 still exists, but it blocks traffic, which prevents any loop possibility."

In other words, this removal of vlan 1 was not always possible on all switches, e.g. Cisco added this feature some time ago.

Solution

As a workarround, VLAN 1 should be allowed on trunked Cisco ports facing the ES1-24 switches.

The Oracle ES2-64 switch with newer SEFOS version 2.x actually can remove VLAN 1, and then it does not appear in the spanning tree output.

References

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