Netgear XCM8806 Chassis User Manual - Page 548
Configuring Edge Safeguard, To disable edge safeguard on an edge port
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NETGEAR 8800 User Manual Configuring Edge Safeguard Loop prevention and detection on an edge port configured for RSTP is called "edge safeguard." You configure edge safeguard on RSTP edge ports to prevent accidental or deliberate misconfigurations (loops) resulting from connecting two edge ports together or by connecting a hub or other non-STP switch to an edge port. Edge safeguard also limits the impact of broadcast storms that might occur on edge ports. This advanced loop prevention mechanism improves network resiliency but does not interfere with the rapid convergence of edge ports. An edge port configured with edge safeguard immediately enters the forwarding state and transmits BPDUs. If a loop is detected, STP blocks the port. By default, an edge port without edge safeguard configured immediately enters the forwarding state but does not transmit BPDUs unless a BPDU is received by that edge port. You can also configure edge safeguard for loop prevention and detection on an MSTP edge port. To configure an edge port and enable edge safeguard on that port, use the following command: configure stpd ports link-type [[auto | broadcast | point-to-point] | edge {edge-safeguard [enable | disable] {bpdu-restrict} {recovery-timeout }}] If you have already configured a port as an edge port and you want to enable edge safeguard on the port, use the following command: configure {stpd} ports edge-safeguard enable {bpdu-restrict} {recovery-timeout {}} To disable edge safeguard on an edge port, use one of the following commands: • configure {stpd} ports edge-safeguard disable {bpdu-restrict} {recovery-timeout {}} • configure stpd ports link-type [[auto | broadcast | point-to-point] | edge {edge-safeguard [enable | disable] {bpdu-restrict} {recovery-timeout }}] In 802.1D-1998, ports that connect to non-STP devices are edge ports. Edge ports do not participate in RSTP, and their role is not confirmed. Edge ports immediately enter the forwarding state unless the port receives a BPDU. In that case, edge ports enter the blocking state. The edge port remains in the blocking state until it stops receiving BPDUs and the message age timer expires. XCM8800 supports an enhanced bridge detection method, which is part of the 802.1D-2004 standard. Ports that connect to non-STP devices are still considered edge ports. However, if you have an 802.1D-2004 compliant edge port, the bridge detection mechanism causes the edge port to transition to a non-edge port upon receiving a BPDU. If the former edge port does not receive a subsequent BPDU during a pre-determined interval, the port attempts to become an edge port. 548 | Chapter 18. STP