Ovs交换机环路

现象：node3节点挂了，从node4 ssh上去 ping不通网关192.168.19.254。
解决办法：现在通过串口minicom登录交换机，利用内置的安全保护机制阻止网络风暴。

1. 先查看网桥是否正确连接

node3：$ ovs-vsctl show：

1. br-in
   
2. br-out
   

2. minicom登录交换机并enable

Switch#show logging
Syslog logging: enabled (0 messages dropped, 0 messages rate-limited, 0 flushes)

No Active Message Discriminator.



No Inactive Message Discriminator.


    Console logging: level debugging, 63 messages logged, xml disabled,
                     filtering disabled
    Monitor logging: level debugging, 0 messages logged, xml disabled,
                     filtering disabled
    Buffer logging:  level debugging, 63 messages logged, xml disabled,
                    filtering disabled
    Exception Logging: size (4096 bytes)
    Count and timestamp logging messages: disabled
    File logging: disabled
    Persistent logging: disabled

No active filter modules.

    Trap logging: level informational, 66 message lines logged
        Logging Source-Interface:       VRF Name:

Log Buffer (4096 bytes):
hanged state to up
Mar 30 01:28:15.449: %LINK-3-UPDOWN: Interface GigabitEthernet0/10, changed stap
Mar 30 01:28:15.449: %LINK-3-UPDOWN: Interface GigabitEthernet0/12, changed stap
Mar 30 01:28:15.486: %LINK-3-UPDOWN: Interface GigabitEthernet0/14, changed stap
Mar 30 01:28:15.486: %LINK-3-UPDOWN: Interface GigabitEthernet0/15, changed stap
Mar 30 01:28:15.544: %LINK-3-UPDOWN: Interface GigabitEthernet0/19, changed stap
Mar 30 01:28:15.565: %LINK-3-UPDOWN: Interface GigabitEthernet0/2, changed statp
Mar 30 01:28:15.570: %LINK-3-UPDOWN: Interface GigabitEthernet0/6, changed statp
Mar 30 01:28:15.607: %LINK-3-UPDOWN: Interface GigabitEthernet0/13, changed stap
Mar 30 01:28:15.607: %LINK-3-UPDOWN: Interface GigabitEthernet0/16, changed stap
Mar 30 01:28:15.643: %LINK-3-UPDOWN: Interface GigabitEthernet0/9, changed statp
Mar 30 01:28:15.643: %LINK-3-UPDOWN: Interface GigabitEthernet0/24, changed stap
Mar 30 01:28:15.816: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthn
Mar 30 01:28:16.451: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.451: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.482: %LINK-3-UPDOWN: Interface GigabitEthernet0/11, changed stap
Mar 30 01:28:16.487: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.487: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.545: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.566: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.571: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.608: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.608: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.645: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.645: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:16.723: %LINK-3-UPDOWN: Interface GigabitEthernet0/17, changed stap
Mar 30 01:28:16.723: %LINK-3-UPDOWN: Interface GigabitEthernet0/18, changed stap
Mar 30 01:28:16.765: %LINK-3-UPDOWN: Interface GigabitEthernet0/20, changed stap
Mar 30 01:28:17.484: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:17.725: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:17.725: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:17.767: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:21.772: %PKI-6-AUTOSAVE: Running configuration saved to NVRAM
Mar 30 01:28:24.986: %LINK-3-UPDOWN: Interface GigabitEthernet0/7, changed statp
Mar 30 01:28:25.988: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:37.218: %LINK-3-UPDOWN: Interface GigabitEthernet0/22, changed stap
Mar 30 01:28:38.219: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthp
Mar 30 01:28:42.193: %DTP-5-DOMAINMISMATCH: Unable to perform trunk negotiation.
Mar 30 02:18:10.717: %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on Gigab.
Mar 30 02:18:10.717: %PM-4-ERR_DISABLE: loopback error detected on Gi0/19, putte
Mar 30 02:18:11.724: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthn
Mar 30 02:18:12.730: %LINK-3-UPDOWN: Interface GigabitEthernet0/19, changed stan
Switch#
Switch#
Switch#
Switch#configure
Configuring from terminal, memory, or network [terminal]? 
Enter configuration commands, one per line.  End with CNTL/Z.
Switch(config)#errdisable recovery cause loopback
Switch(config)#eixt
                ^
% Invalid input detected at '^' marker.

Switch(config)#show errdisable recovery
                 ^
% Invalid input detected at '^' marker.

Switch(config)#show errdisable recovery
                 ^
% Invalid input detected at '^' marker.

Switch(config)#exit
Switch#
Mar 30 02:59:05.434: %SYS-5-CONFIG_I: Configured from console by consoleshow 
% Type "show ?" for a list of subcommands
Switch#
Switch#show errdisable recovery
ErrDisable Reason            Timer Status
-----------------            --------------
bpduguard                    Disabled
channel-misconfig (STP)      Disabled
dhcp-rate-limit              Disabled
dtp-flap                     Disabled
gbic-invalid                 Disabled
inline-power                 Disabled
link-flap                    Disabled
mac-limit                    Disabled
loopback                     Enabled
pagp-flap                    Disabled
port-mode-failure            Disabled
pppoe-ia-rate-limit          Disabled
psecure-violation            Disabled
security-violation           Disabled
sfp-config-mismatch          Disabled
small-frame                  Disabled
storm-control                Disabled
udld                         Disabled
vmps                         Disabled
psp                          Disabled

Timer interval: 300 seconds

Interfaces that will be enabled at the next timeout:

Interface       Errdisable reason       Time left(sec)
---------       -----------------       --------------
Gi0/19                  loopback          264

Switch#
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Switch#show errdisable recovery