It has moved to the learning state, and after another ~ 15 seconds, it looks like this: Course Contents Spanning-Tree Unit 1: Introduction Introduction to Spanning-Tree Spanning-Tree Cost Calculation Spanning-Tree Port States Spanning-Tree TCN (Topology Change Notification) ...
The logic that manages transition of states in the spanning tree protocol entity identifies ports which are changing to a designated port role, and issues a message on such ports informing the downstream port that the issuing port is able to assume a forwarding state. The logic begins the ...
如下图所示:在某些情况下,因为运行不同的协议,导致Cisco的spanning-tree生成树计算结果与Juniper的计算结果不一致,Cisco切断了左边端口,而Juniper切断了右边的端口。从而在平滑迁移过程中,Cisco和Juniper互联的临时线路被Spanning-tree完全阻断。 问题分析: 乍看之下,觉得两个完全不同的厂商协议,肯定没法互联互通。但是如...
Mechanisms for use on designated ports in spanning tree protocol entities allow such ports to transition to a forwarding state on the basis of actual communication delays between neighboring bridges, rather than upon expiration of forwarding delay timers. The logic that manages transition of states in...
There is a Cisco specific feature used in Spanning Tree Protocol (STP). This feature is called “Portfast”. With Portfast, STP Learning and Listenning States can be bypassed and a port configured with Portfast can immediatelly go to the Forwarding State. This Portfast feature is used for Host...
When two ports on a switch are part of a loop, the spanning-tree and path cost settings control which port is put in the forwarding state and which is put in the blocking state. The spanning-tree port priority valu...
STP(Spanning Tree Protocol) (IEEE 802.1D) 生成树协议 是一种逻辑阻塞。 ·在一个交换网络中有可能会出现单点失效的故障,所谓单点失效,指的是由于网络中某一台设备的故障,而影响整个网络的通信。为了避免单点失效,提高网络的可靠性,可以通过构建一个冗余拓扑来解决。但是,一个冗余的拓扑,又会给我们的网络造成...
Port Vlans in spanning tree forwarding state and not pruned Et0/0 1,10,20 SW13# ###接口NativeVLAN信息### SW13#show int e0/0 switchport | in Native Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled ...
Spanning Tree Port States Any given switch port running STP is going to be in one of five states: Blocking– Port won’t transmit or receive data but will still listen to BPDUs. All ports are in the blocking state once powered up. ...
起用portfast往往是因为一些应用的要求,cisco是建议将符合条件的port设置成portfast的. PS: 将SWITCH的端口设置为spanning-tree portfast后,如果这个端口接到其他SWITCH或者HUB上就可能造成环路问题。加上spanning-tree bpduguard enable之后,当这个端口在收到BPDU包后就会进入errdisable状态,从而避免环路。