当 Keepalive 会话状态关闭时，Dell Networking SONiC MC-LAG 将受到影响

摘要: 本文介绍当 SONiC 中的 keepalive 会话状态下降时 MC-LAG 如何受到影响。

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症状

当 SONiC 中的 keepalive 会话状态下降时，MC-LAG 会受到影响。
在 keepalive 会话关闭时，会看到以下 MC-LAG 状态：  
SONIC-1# show mclag brief
 
Domain ID            : 1
Role                 : active
Session Status       : down
Peer Link Status     : up
Source Address       : 192.168.2.1
Peer Address         : 192.168.2.2
Peer Link            : PortChannel100
Keepalive Interval   : 1 secs
Session Timeout      : 30 secs
Delay Restore        : 300 secs
System Mac           : XX:XX:XX:XX:XX:XX
Mclag System Mac     : 00:00:00:00:00:01
 
 
Number of MLAG Interfaces:1
-----------------------------------------------------------
MLAG Interface       Local/Remote Status 
-----------------------------------------------------------
PortChannel1             up/unknown

原因

当 SONiC 中的 keepalive 会话状态下降时，MC-LAG 会受到影响。SONiC 中的 keepalive 配置了 IPv4 L3 通信，类似于 OS9 和 OS10 中的备份链路，这通常不会影响 VLT-Portchannel 状态。OS9 和 OS10 中的对等链路状态将改为影响 VLT-Portchannel 状态。但是，在 SONiC 中，keepalive 会话状态必须处于正常运行状态，MC-LAG 才能正常运行。对于 keepalive 链路，在 MC-LAG 对等设备之间传输定期心跳信号，还用于同步 MC-LAG 对等设备之间的状态。与 SONiC 不同，OS9 和 OS10 使用对等链路在 VLT 对等设备之间同步状态。

MCLAG 术语描述

当 keepalive 会话链路关闭后，由于两个对等设备之间的同步失败，两个 MC-LAG 对等设备上的 MC-LAG 状态将变为正常运行/未知。

两个对等设备之间的同步失败

处于正常状态 
SONIC-1#show version 
 
Software Version  : 4.1.0-Enterprise_Base
Product           : Enterprise SONiC Distribution by Dell Technologies
Distribution      : Debian 10.13
Kernel            : 5.10.0-8-2-amd64
Config DB Version : version_4_1_1
Build Commit      : 93589a15db
Build Date        : Tue Apr 18 17:56:48 UTC 2023
Built By          : sonicbld@sonic-lvn-csg-001
Platform          : x86_64-kvm_x86_64-r0
HwSKU             : DellEMC-S5248f-P-25G-DPB

SONIC-1# show ip interfaces 
Flags: U-Unnumbered interface, A-Anycast IP
-----------------------------------------------------------------------------------------------------------------
Interface            IP address/mask                              VRF                 Admin/Oper     Flags          
-----------------------------------------------------------------------------------------------------------------
PortChannel200       192.168.2.1/24                                                   up/up                         
Vlan636              172.16.0.1/24                                                    up/up                         
SONIC-1# 
SONIC-1# 
SONIC-1# show PortChannel summary 
Flags(oper-status):  D - Down U - Up (portchannel) P - Up in portchannel (members)
----------------------------------------------------------------------------------------------------------------------------
Group               PortChannel                   Type                Protocol          Member Ports
----------------------------------------------------------------------------------------------------------------------------
1                   PortChannel1   (U)            Eth                 LACP                 Eth1/1(P)
100                 PortChannel100 (U)            Eth                 NONE                 Eth1/8(P)
                                                                                           Eth1/9(P)
200                 PortChannel200 (U)            Eth                 LACP                 Eth1/5(P)
                                                                                           Eth1/6(P)
SONIC-1# 
SONIC-1# 
SONIC-1# show mclag brief
 
Domain ID            : 1
Role                 : active
Session Status       : up
Peer Link Status     : up
Source Address       : 192.168.2.1
Peer Address         : 192.168.2.2
Peer Link            : PortChannel100
Keepalive Interval   : 1 secs
Session Timeout      : 30 secs
Delay Restore        : 300 secs
System Mac           : XX:XX:XX:XX:XX:XX
Mclag System Mac     : 00:00:00:00:00:01
 
 
Number of MLAG Interfaces:1
-----------------------------------------------------------
MLAG Interface       Local/Remote Status 
-----------------------------------------------------------
PortChannel1             up/up
SONIC-1# 
SONIC-1# 
SONIC-1# show running-configuration interface PortChannel 1
!
interface PortChannel1 mode active
 switchport trunk allowed Vlan 636
 no shutdown
 mclag 1
SONIC-1# show running-configuration interface PortChannel 100
!
interface PortChannel100 mode on
 switchport trunk allowed Vlan 1-4094
 no shutdown
SONIC-1# show running-configuration interface PortChannel 200
!
interface PortChannel200 mode active
 no shutdown
 ip address 192.168.2.1/24
SONIC-1# 
SONIC-1# 
SONIC-1# ping 172.16.0.3  //IP address assigned to VLAN636 on uplink SW.
PING 172.16.0.3 (172.16.0.3) 56(84) bytes of data.
64 bytes from 172.16.0.3: icmp_seq=1 ttl=64 time=3.26 ms
64 bytes from 172.16.0.3: icmp_seq=2 ttl=64 time=3.47 ms
64 bytes from 172.16.0.3: icmp_seq=3 ttl=64 time=3.21 ms
64 bytes from 172.16.0.3: icmp_seq=4 ttl=64 time=2.84 ms
64 bytes from 172.16.0.3: icmp_seq=5 ttl=64 time=11.1 ms
^C
SONIC-1# 

SONIC-2#show version 
 
Software Version  : 4.1.0-Enterprise_Base
Product           : Enterprise SONiC Distribution by Dell Technologies
Distribution      : Debian 10.13
Kernel            : 5.10.0-8-2-amd64
Config DB Version : version_4_1_1
Build Commit      : 93589a15db
Build Date        : Tue Apr 18 17:56:48 UTC 2023
Built By          : sonicbld@sonic-lvn-csg-001
Platform          : x86_64-kvm_x86_64-r0
HwSKU             : DellEMC-S5248f-P-25G-DPB

SONIC-2# show ip interfaces 
Flags: U-Unnumbered interface, A-Anycast IP
-----------------------------------------------------------------------------------------------------------------
Interface            IP address/mask                              VRF                 Admin/Oper     Flags          
-----------------------------------------------------------------------------------------------------------------
PortChannel200       192.168.2.2/24                                                   up/up                         
Vlan636              172.16.0.2/24                                                    up/up                         
SONIC-2# 
SONIC-2# 
SONIC-2# show PortChannel summary 
Flags(oper-status):  D - Down U - Up (portchannel) P - Up in portchannel (members)
----------------------------------------------------------------------------------------------------------------------------
Group               PortChannel                   Type                Protocol          Member Ports
----------------------------------------------------------------------------------------------------------------------------
1                   PortChannel1   (U)            Eth                 LACP                 Eth1/1(P)
100                 PortChannel100 (U)            Eth                 NONE                 Eth1/8(P)
                                                                                           Eth1/9(P)
200                 PortChannel200 (U)            Eth                 LACP                 Eth1/5(P)
                                                                                           Eth1/6(P)
SONIC-2# 
SONIC-2# 
SONIC-2# show mclag brief
 
Domain ID            : 1
Role                 : standby
Session Status       : up
Peer Link Status     : up
Source Address       : 192.168.2.2
Peer Address         : 192.168.2.1
Peer Link            : PortChannel100
Keepalive Interval   : 1 secs
Session Timeout      : 30 secs
Delay Restore        : 300 secs
System Mac           : XX:XX:XX:XX:XX:XX
Mclag System Mac     : 00:00:00:00:00:01
 
 
Number of MLAG Interfaces:1
-----------------------------------------------------------
MLAG Interface       Local/Remote Status 
-----------------------------------------------------------
PortChannel1             up/up
SONIC-2# 
SONIC-2# 
SONIC-2# 
SONIC-2# 
SONIC-2# show running-configuration interface PortChannel 1
!
interface PortChannel1 mode active
 switchport trunk allowed Vlan 636
 no shutdown
 mclag 1
SONIC-2# show running-configuration interface PortChannel 100
!
interface PortChannel100 mode on
 switchport trunk allowed Vlan 1-4094
 no shutdown
SONIC-2# show running-configuration interface PortChannel 200
!
interface PortChannel200 mode active
 no shutdown
 ip address 192.168.2.2/24
SONIC-2# 
SONIC-2# 
SONIC-2# ping 172.16.0.3
PING 172.16.0.3 (172.16.0.3) 56(84) bytes of data.
64 bytes from 172.16.0.3: icmp_seq=1 ttl=64 time=3.48 ms
64 bytes from 172.16.0.3: icmp_seq=2 ttl=64 time=2.94 ms
^CSONIC-2#


处于问题状态（通过关闭 Po200 成员端口关闭 Keepalive-link 状态） 
SONIC-1# show mclag brief
 
Domain ID            : 1
Role                 : active
Session Status       : down
Peer Link Status     : up
Source Address       : 192.168.2.1
Peer Address         : 192.168.2.2
Peer Link            : PortChannel100
Keepalive Interval   : 1 secs
Session Timeout      : 30 secs
Delay Restore        : 300 secs
System Mac           : XX:XX:XX:XX:XX:XX
Mclag System Mac     : 00:00:00:00:00:01
 
 
Number of MLAG Interfaces:1
-----------------------------------------------------------
MLAG Interface       Local/Remote Status 
-----------------------------------------------------------
PortChannel1             up/unknown
SONIC-1# 
SONIC-1# 
SONIC-1# ping 172.16.0.3
PING 172.16.0.3 (172.16.0.3) 56(84) bytes of data.
64 bytes from 172.16.0.3: icmp_seq=1 ttl=64 time=8.00 ms
64 bytes from 172.16.0.3: icmp_seq=2 ttl=64 time=3.08 ms
64 bytes from 172.16.0.3: icmp_seq=3 ttl=64 time=2.99 ms
64 bytes from 172.16.0.3: icmp_seq=4 ttl=64 time=2.92 ms
64 bytes from 172.16.0.3: icmp_seq=5 ttl=64 time=3.07 ms
^C
SONIC-1#
SONIC-2# show PortChannel summary 
Flags(oper-status):  D - Down U - Up (portchannel) P - Up in portchannel (members)
----------------------------------------------------------------------------------------------------------------------------
Group               PortChannel                   Type                Protocol          Member Ports
----------------------------------------------------------------------------------------------------------------------------
1                   PortChannel1   (U)            Eth                 LACP                 Eth1/1(P)
100                 PortChannel100 (U)            Eth                 NONE                 Eth1/8(P)
                                                                                           Eth1/9(P)
200                 PortChannel200 (D)            Eth                 LACP                 Eth1/5(D)
                                                                                          Eth1/6(D)
SONIC-2# show mclag brief
 
Domain ID            : 1
Role                 : standby
Session Status       : down
Peer Link Status     : up
Source Address       : 192.168.2.2
Peer Address         : 192.168.2.1
Peer Link            : PortChannel100
Keepalive Interval   : 1 secs
Session Timeout      : 30 secs
Delay Restore        : 300 secs
System Mac           : XX:XX:XX:XX:XX:XX
Mclag System Mac     : 00:00:00:00:00:01
 
 
Number of MLAG Interfaces:1
-----------------------------------------------------------
MLAG Interface       Local/Remote Status 
-----------------------------------------------------------
PortChannel1             up/unknown
SONIC-2# 
SONIC-2# ping 172.16.0.3
PING 172.16.0.3 (172.16.0.3) 56(84) bytes of data.
From 172.16.0.2 icmp_seq=1 Destination Host Unreachable
From 172.16.0.2 icmp_seq=1 Destination Host Unreachable
From 172.16.0.2 icmp_seq=1 Destination Host Unreachable
From 172.16.0.2 icmp_seq=1 Destination Host Unreachable
^C
 
 

解决方案

为了使 MC-LAG 保持正常运行，而不会出现任何问题，keepalive 链路状态还必须保持正常运行。管理端口通常用于 keepalive 链路，但分配有 IP 地址的端口通道可用于 keepalive 链路以实现冗余目的。本知识库文章中所述的行为（当 keepalive 链路状态停止时 MC-LAG 将受到影响），至少在 SONiC 版本 4.2.0 之前，应在所有版本中进行描述。

受影响的产品

Enterprise SONiC Distribution, PowerSwitch N3200-ON, PowerSwitch S5212F-ON, PowerSwitch S5224F-ON, PowerSwitch S5232F-ON, PowerSwitch S5248F-ON, PowerSwitch S5296F-ON, PowerSwitch Z9100-ON, PowerSwitch Z9264F-ON, PowerSwitch Z9332F-ON
文章属性
文章编号: 000213968
文章类型: Solution
上次修改时间: 23 1月 2024
版本:  3
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