Keepalive Session 상태가 다운되면 Dell Networking SONiC MC-LAG가 영향을 받습니다.
Summary: 이 문서에서는 SONiC에서 유지 세션 상태가 다운되는 경우 MC-LAG가 어떻게 영향을 받는지 설명합니다.
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Symptoms
SONiC에서 유지 세션 상태가 다운되면 MC-LAG가 영향을 받습니다.
Keepalive 세션이 중단되는 시점에 다음과 같은 MC-LAG 상태가 표시됩니다.
Keepalive 세션이 중단되는 시점에 다음과 같은 MC-LAG 상태가 표시됩니다.
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
SONiC에서 유지 세션 상태가 다운되면 MC-LAG가 영향을 받습니다. SONiC의 Keepalive는 OS9 및 OS10의 백업 링크와 유사한 IPv4 L3 통신으로 구성되며 일반적으로 VLT-Portchannel 상태에 영향을 주지 않습니다. OS9 및 OS10의 피어 링크 상태는 대신 VLT-Portchannel 상태에 영향을 미칩니다. 그러나 SONiC에서는 MC-LAG가 가동되려면 유지 세션 상태가 가동되어야 합니다. Keepalive Link의 경우 MC-LAG 피어 디바이스 간에 주기적으로 하트비트 전송되며 MC-LAG 피어 디바이스 간의 상태를 동기화하는 데도 사용됩니다. SONiC와 달리 OS9 및 OS10은 피어 링크를 사용하여 VLT 피어 디바이스 간의 상태를 동기화합니다.
Keepalive 세션 링크가 다운되면 두 피어 디바이스 간의 동기화 실패로 인해 MC-LAG 피어 디바이스의 MC-LAG 상태가 작동/알 수 없게 됩니다.
정상 상태
문제 상태(Po200 구성원 포트를 종료하여 Keepalive-link Status Down)
Keepalive 세션 링크가 다운되면 두 피어 디바이스 간의 동기화 실패로 인해 MC-LAG 피어 디바이스의 MC-LAG 상태가 작동/알 수 없게 됩니다.
정상 상태
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#
문제 상태(Po200 구성원 포트를 종료하여 Keepalive-link Status Down)
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
MC-LAG가 문제 없이 계속 작동하려면 Keepalive Link 상태도 계속 가동 및 실행되어야 합니다. 관리 포트는 일반적으로 유지 링크에 사용되지만 IP 주소가 할당된 포트 채널은 이중화를 위해 유지 링크에 사용할 수 있습니다. 적어도 SONiC 버전 4.2.0까지 모든 버전에서 이 KB 문서에 설명된 동작(유지 링크 상태가 다운될 때 MC-LAG가 영향을 받음)이 예상됩니다.
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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