问

交换机如何设置专线链路故障后打通阻塞线路

2021-02-13提问

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阿白

阿白零段

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问题描述：

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公司总部核心交换机到下联机构原本一条同城专线，下联机构有2台S5120V2，2台设备间原本用网线端口聚合连接，原本下联专线只有一条，连载S5120V2-A交换机上。

为了增加网络的冗余性和抗风险性，现在准备再拉另一运营商的一条同城专线到下联结构准备连在S5120V2-B上。

请问可否进行一定的限制，让S5120V2-A到S5120V2-B的线路，平时阻塞，当A或B上联专线故障时，打通A-B间的链路？

能否有大佬指导，如何个方案，并给点具体实施案例，谢谢。

组网及组网描述：

最佳答案

求求给个采纳

求求给个采纳八段

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可以考虑用EAA，如果检测到上联端口down的日志，就在A-B间的聚合undo shut

https://www.h3c.com/cn/d_202009/1332178_30005_0.htm

求求给个采纳发表时间：2021-02-13 更多>>

https://www.h3c.com/cn/d_202009/1332178_30005_0.htm

求求给个采纳发表时间：2021-02-13

3 个回答

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lilili

lilili 九段

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交换机使用二层接口互联接成环路时，可以通过生成树协议进行防环，正常情况下AB之间为阻塞状态，如果专线断开，AB之间的线路会变为转发状态。

确认专线可以转发stp报文，将生成树的根桥设置在5560x即可

# 在MSTP模式下，配置设备为根桥。

<Sysname> system-view

[Sysname] stp root primary

得闲饮茶013

得闲饮茶013 九段

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您好，请知：

可以考虑STP，以下是配置案例，请参考：

本案例采用H3C HCL模拟器来模拟STP的部署，在网络拓扑图中已经明确标识了具体的设备和VLAN划分，其中SW部署IRF模式，SW2和SW3为接入交换机，为了实现链路冗余，将SW2和SW3连接起来，接着使用STP COST来指定端口的开销来实现链路的“主备”，在该网络拓扑中，SW2和SW3互联的端口都配置STP COST为100，这样不仅能避免环路，还能实现链路冗余。

配置步骤

1、部署SW的IRF：

1号设备IRF部署：

sys

System View: return to User View with Ctrl+Z.

[H3C]irf member 1 renumber 1

Renumbering the member ID may result in configuration change or loss. Continue?[Y/N]:y

[H3C]int range ten 1/0/49 to ten 1/0/50

[H3C-if-range]shutdown

[H3C-if-range]quit

[H3C]irf-port 1/1

[H3C-irf-port1/1]port group interface Ten-GigabitEthernet 1/0/49

[H3C-irf-port1/1]port group interface Ten-GigabitEthernet 1/0/50

[H3C-irf-port1/1]quit

[H3C]int range ten 1/0/49 to ten 1/0/50

[H3C-if-range]undo shutdown

[H3C-if-range]quit

[H3C]irf-port-configuration active

[H3C]%Oct 24 10:07:34:375 2020 H3C STM/6/STM_LINK_UP: IRF port 1 came up.

[H3C]save

The current configuration will be written to the device. Are you sure? [Y/N]:y

Please input the file name(*.cfg)[flash:/startup.cfg]

(To leave the existing filename unchanged, press the enter key):

Validating file. Please wait...

Saved the current configuration to mainboard device successfully.

2号设备IRF部署：

[H3C]irf member 1 renumber 2

Renumbering the member ID may result in configuration change or loss. Continue?[Y/N]:y

[H3C]int range ten 1/0/49 to ten 1/0/50

[H3C-if-range]shutdown

[H3C-if-range]quit

[H3C]irf-port 1/2

[H3C-irf-port1/2]port group interface Ten-GigabitEthernet 1/0/49

[H3C-irf-port1/2]port group interface Ten-GigabitEthernet 1/0/50

[H3C-irf-port1/2]quit

[H3C]int range ten 1/0/49 to ten 1/0/50

[H3C-if-range]undo shutdown

[H3C-if-range]quit

[H3C]save

The current configuration will be written to the device. Are you sure? [Y/N]:y

Please input the file name(*.cfg)[flash:/startup.cfg]

(To leave the existing filename unchanged, press the enter key):

Validating file. Please wait...

Saved the current configuration to mainboard device successfully.

[H3C]irf-port-configuration active

[H3C]%Oct 24 10:10:59:609 2020 H3C STM/6/STM_LINK_UP: IRF port 2 came up.

[H3C]save

The current configuration will be written to the device. Are you sure? [Y/N]:y

Please input the file name(*.cfg)[flash:/startup.cfg]

(To leave the existing filename unchanged, press the enter key):

flash:/startup.cfg exists, overwrite? [Y/N]:y

Validating file. Please wait...

Saved the current configuration to mainboard device successfully.

重启部署了IRF的两台设备。

IRF部署已完成：

1、配置SW的VLAN及STP

sys

System View: return to User View with Ctrl+Z.

[H3C]sysname SW

[SW]vlan 10

[SW-vlan10]quit

[SW]vlan 20

[SW-vlan20]quit

[SW]int range gi 1/0/1 gi 2/0/1

[SW-if-range]port link-type trunk

[SW-if-range]undo port trunk permit vlan 1

[SW-if-range]port trunk permit vlan 10 20

[SW-if-range]quit

[SW]int vlan 10

[SW-Vlan-interface10]ip address 192.168.10.1 24

[SW-Vlan-interface10]quit

[SW]int vlan 20

[SW-Vlan-interface20]ip address 192.168.20.1 24

[SW-Vlan-interface20]quit

[SW]stp global enable

[SW]stp mode stp

[SW]stp priority 0

SW2配置：

sys

System View: return to User View with Ctrl+Z.

[H3C]sysname SW2

[SW2]vlan 10

[SW2-vlan10]quit

[SW2]vlan 20

[SW2-vlan20]quit

[SW2]int range gi 1/0/1 to gi 1/0/2

[SW2-if-range]port link-type trunk

[SW2-if-range]undo port trunk permit vlan 1

[SW2-if-range]port trunk permit vlan 10 20

[SW2-if-range]quit

[SW2]int gi 1/0/3

[SW2-GigabitEthernet1/0/3]port link-type access

[SW2-GigabitEthernet1/0/3]port access vlan 10

[SW2-GigabitEthernet1/0/3]stp edged-port

Edge port should only be connected to terminal. It will cause temporary loops if port GigabitEthernet1/0/3 is connected to bridges. Please use it carefully.

[SW2-GigabitEthernet1/0/3]quit

[SW2]stp global enable

[SW2]stp mode stp

[SW2]int gi 1/0/2

[SW2-GigabitEthernet1/0/2]stp cost 100

[SW2-GigabitEthernet1/0/2]quit

SW3配置：

sys

System View: return to User View with Ctrl+Z.

[H3C]sysname SW3

[SW3]vlan 10

[SW3-vlan10]quit

[SW3]vlan 20

[SW3-vlan20]quit

[SW3]int range gi 1/0/1 to gi 1/0/2

[SW3-if-range]port link-type trunk

[SW3-if-range]undo port trunk permit vlan 1

[SW3-if-range]port trunk permit vlan 10 20

[SW3-if-range]quit

[SW3]int gi 1/0/3

[SW3-GigabitEthernet1/0/3]port link-type access

[SW3-GigabitEthernet1/0/3]port access vlan 20

[SW3-GigabitEthernet1/0/3]stp edged-port

Edge port should only be connected to terminal. It will cause temporary loops if port GigabitEthernet1/0/3 is connected to bridges. Please use it carefully.

[SW3-GigabitEthernet1/0/3]quit

[SW3]stp global enable

[SW3]stp mode stp

[SW3]int gi 1/0/2

[SW3-GigabitEthernet1/0/2]stp cost 100

[SW3-GigabitEthernet1/0/2]quit

填写PC的IP，并测试PING网关：