當保留會話狀態中斷時，Dell Networking SONiC MC-LAG 將會受到影響
Summary: 本文說明當 SONiC 中的保留會話狀態下降時，MC-LAG 會如何受到影響。
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Symptoms
當SONiC中的保留會話狀態中斷時，MC-LAG 會受到影響。
在保留會話關閉時，會看到下列 MC-LAG 狀態：
在保留會話關閉時，會看到下列 MC-LAG 狀態：
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
Cause
當 SONiC 中的保留會話狀態中斷時，MC-LAG 會受到影響。SONiC 中的 keepalive 是使用 IPv4 L3 通訊設定，類似於 OS9 和 OS10 中的備份連結，通常不會影響 VLT-Portchannel 狀態。OS9 和 OS10 中的對等鏈接狀態反而會影響 VLT-Portchannel 狀態。但是，在SONiC中，保留工作階段狀態必須保持在最新狀態，才能啟用MC-LAG。若為保留連結，請定期在MC-LAG對等裝置之間承載活動訊號，並用於同步處理MC-LAG對等裝置之間的狀態。與 SONiC 不同，OS9 和 OS10 使用對等連結在 VLT 對等裝置之間同步處理狀態。
當保留會話連結中斷后，兩個 MC-LAG 對等裝置上的 MC-LAG 狀態會因為兩個對等裝置之間的同步處理失敗而變成向上/未知。
處於正常狀態
處於問題狀態 （透過關閉 Po200 成員埠來關閉 Keepalive-link Status）
當保留會話連結中斷后，兩個 MC-LAG 對等裝置上的 MC-LAG 狀態會因為兩個對等裝置之間的同步處理失敗而變成向上/未知。
處於正常狀態
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#
處於問題狀態 （透過關閉 Po200 成員埠來關閉 Keepalive-link Status）
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
Resolution
若要讓 MC-LAG 保持正常運作且沒有任何問題，保持鏈接狀態也必須保持正常運作。管理埠通常用於保留連結，但已指派IP位址的埠通道可用於保留連結作為備援用途。此知識庫文章中所述的行為 （當保留鏈接狀態中斷時，MC-LAG 將會受到影響），至少在SONiC版本4.2.0之前，所有版本都預期會受到影響。
Affected Products
Enterprise SONiC Distribution, Dell EMC Networking 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-ONArticle Properties
Article Number: 000213968
Article Type: Solution
Last Modified: 23 Jan 2024
Version: 3
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