A Cisco switch rstp fault

A rstp fault

Early in the morning, I received a call and the ping gateway to the direct connection failed.

No interface arp table for dis ARP

Dis mac-address without related interfaces

It seems that there are only physical problems, but it is said that interfaces and cables are okay.

View dis stp interface Ethernet 1/0/1

---- [CIST] [Port1 (Ethernet1/0/1)] [DISCARDING] ----

Port Protocol: enabled

Port Role: CIST Designated Port

Port Priority: 128

Port Cost (Legacy): Config = auto/Active = 200

Desg. Bridge/Port: 32768.000f-e264-eeaf/128.1

Port Edged: Config = disabled/Active = disabled

Point-to-point: Config = auto/Active = true

Transmit Limit: 10 packets/hello-time

BT Wireless Network cracking tutorial

Protection Type: None

Mstp bpdu format: Config = legacy

Port Config

Digest Snooping: disabled

Num of Vlans Mapped: 1

PortTimes: Hello 2 s Cisco Learning video material download center MaxAge 20 s FwDly 15 s MsgAge 1 s RemHop 20

BPDU Sent: 2215

TCN: 0, Config: 0, RST: 2215, MST: 0

BPDU Received: 0

TCN: 0, Config: 0, RST: 0, MST: 0

Cisco router configuration

================================ The port role is the specified interface, but the status is discarded, no forwarding is provided.

It turns out to be an rstp problem.

Why is a specified interface discarded? The specified interface should be fowding.

Suddenly, a friend prompts me that if the rstp interface is selected as the specified interface, the downstream confirmation is required to enter the forwarding status.

The P/A mechanism requires the link between the two switches to be point-to-point full duplex. It should be noted that once the P/A negotiation fails, the two Forward Delay in the normal STP will be waited. At this time, the behavior will return to the STP Cisco router switch.

If you do not receive the agreement, but you do not actually receive it, it should be because the P/A negotiation fails, and the traditional STP and switching will be implemented.

But it stays in the discading. Discard status.

= ---------------------------------------

Resolve the fault: Specify the 1/0/2 interface as the edge interface Cisco router switch Simulation Software to solve the problem.