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User Manual

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Users Manual of XGS-6350-24X4C
Command Purpose
spanning-tree backbonefast Enables backbone fast feature.
no spanning-tree backbonefast Disables backbone fast feature.
20.1.2.7 Configuring Root Guard
Root guard enabled on an interface applies to all the VLANs to which the interface belongs. Do not enable the
root guard on interfaces to be used by the UplinkFast feature. With UplinkFast, the backup interfaces (in the
blocked state) replace the root port in the case of a failure. However, if root guard is also enabled, all the
backup interfaces used by the UplinkFast feature are placed in the root-inconsistent state (blocked) and are
prevented from reaching the forwarding state.
Root Guard feature acts differently somehow in SSTP/PVST and RSTP/MSTP. In SSTP/PVST mode, Root
port is always blocked by Root Guard. In RSTP/MSTP mode, Root port won’t be blocked until receiving higher
level BPDU. A port which formerly plays the Root role will not be blocked.
Follow these steps to enable root guard on an interface.:
Command Purpose
spanning-tree guard root Enables root guard feature on the
interface.
no spanning-tree guard Disables root guard and loop guard
features on the interface.
spanning-tree guard none Disables root guard and loop guard
features on the interface.
20.1.2.8 Configuring Loop Guard
You can use loop guard to prevent alternate or root ports from becoming designated ports because of a failure
that leads to a unidirectional link. This feature is most effective when it is configured on the entire switched
network. Loop guard operates only on interfaces that are considered point-to-point by the spanning tree.
Loop Guard feature acts differently somehow in SSTP/PVST. In SSTP/PVST mode,, the designated port is
always blocked by Loop Guard. In RSTP/MSTP, the designated port is always blocked by Loop Guard. In
RSTP/MSTP mode, the port will be blocked only when it changes into the designated port because of
inaccessibility to receiving BPDU. A port which is provided with the designated role due to receiving the lower
level BPDU will not be blocked by Loop Guard.
Follow these steps to enable loop guard in global configuration mode.:
Command Purpose
spanning-tree loopguard default Globally enables loop guard feature. It is
valid to all interfaces.
no spanning-tree loopguard default Globally disables loop guard.