某局点 S6850 M-LAG组网网关不响应arp问题

型号及版本：S6850 6555P01H37

问题描述：M-LAG+VRRP组网，单挂一台服务器，服务器学习不到VRRP虚地址arp，删除空down的 M-LAG口后可以学习到

过程分析：

debug看两设备收发arp 正常，设备上都能学习到服务器的arp

M-LAG-1 arp收发正常

行 2601: [20220823-10:44:46]*Aug 23 10:44:46:777 2022 RZ-6850-A3-403-1-9 ARP/7/ARP_RCV: Received an ARP message, operation: 1, sender MAC: 7cd9-a056-1264, sender IP: 10.96.248.34, target MAC: 0000-0000-0000, target IP: 10.96.248.1

行 2602: [20220823-10:44:46]*Aug 23 10:44:46:777 2022 RZ-6850-A3-403-1-9 ARP/7/ARP_SEND: Sent an ARP message, operation: 2, sender MAC: 0000-5e00-0164, sender IP: 10.96.248.1, target MAC: 7cd9-a056-1264, target IP: 10.96.248.34

行 2607: [20220823-10:44:48]*Aug 23 10:44:48:731 2022 RZ-6850-A3-403-1-9 ARP/7/ARP_RCV: Received an ARP message, operation: 1, sender MAC: 7cd9-a056-1264, sender IP: 10.96.248.34, target MAC: 0000-0000-0000, target IP: 10.96.248.1

行 2608: [20220823-10:44:48]*Aug 23 10:44:48:731 2022 RZ-6850-A3-403-1-9 ARP/7/ARP_SEND: Sent an ARP message, operation: 2, sender MAC: 0000-5e00-0164, sender IP: 10.96.248.1, target MAC: 7cd9-a056-1264, target IP: 10.96.248.34

M-LAG-2 

行 1601: [20220823-10:44:48]*Aug 23 10:44:48:731 2022 RZ-6850-A3-403-1-10 ARP/7/ARP_RCV: Received an ARP message, operation: 1, sender MAC: 7cd9-a056-1264, sender IP: 10.96.248.34, target MAC: 0000-0000-0000, target IP: 10.96.248.1

行 1602: [20220823-10:44:48]*Aug 23 10:44:48:732 2022 RZ-6850-A3-403-1-10 ARP/7/ARP_RCV: Received an ARP message, operation: 2, sender MAC: 0000-5e00-0164, sender IP: 10.96.248.1, target MAC: 7cd9-a056-1264, target IP: 10.96.248.34

行 1606: [20220823-10:44:49]*Aug 23 10:44:49:276 2022 RZ-6850-A3-403-1-10 ARP/7/ARP_RCV: Received an ARP message, operation: 1, sender MAC: 7cd9-a056-1264, sender IP: 10.96.248.34, target MAC: 0000-0000-0000, target IP: 10.96.248.1

行 1607: [20220823-10:44:49]*Aug 23 10:44:49:277 2022 RZ-6850-A3-403-1-10 ARP/7/ARP_RCV: Received an ARP message, operation: 2, sender MAC: 0000-5e00-0164, sender IP: 10.96.248.1, target MAC: 7cd9-a056-1264, target IP: 10.96.248.34

抓包看 arp报文未从单挂口发出

检查配置发现

IPP口没有配置 undo mac-address static source-check enable                              

配置空M-LAG口，VRRP虚mac在备设备上下发，不配置的话，VRRP 不下发虚mac

配置空M-LAG口的情况下，主设备回应的arp reply 报文走IPL链路到备上因为源mac检查被丢了

interface Bridge-Aggregation10

port link-type trunk

port trunk permit vlan all

link-aggregation mode dynamic

port drni intra-portal-port 1

IPP口配置 undo mac-address static source-check enable即可