Table 193 SWITCHING > Spanning Tree Protocol > MSTP > MSTP Port Setup (continued)
LABEL
Root Guard
Apply
Cancel
53.11 Technical Reference
This section provides technical background information on the topics discussed in this chapter.
53.11.1 MSTP Network Example
The following figure shows a network example where two VLANs are configured on the two switches. If
the switches are using STP or RSTP, the link for VLAN 2 will be blocked as STP and RSTP allow only one link
in the network and block the redundant link.
Figure 257 STP/RSTP Network Example
With MSTP, VLANs 1 and 2 are mapped to different spanning trees in the network. Therefore traffic from
the two VLANs travel on different paths. The following figure shows the network example using MSTP.
Chapter 53 Spanning Tree Protocol
DESCRIPTION
Select this check box to enable root guard on this port in order to prevent the switches
attached to the port from becoming the root bridge.
With root guard enabled, a port is blocked when the Switch receives a superior BPDU on it.
The Switch allows traffic to pass through this port again when the switch connected to the
port stops to send superior BPDUs.
Click Apply to save your changes to the Switch's run-time memory. The Switch loses these
changes if it is turned off or loses power, so use the Save link on the top navigation panel to
save your changes to the non-volatile memory when you are done configuring.
Click Cancel to begin configuring this screen afresh.
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