S6900三层汇聚子接口无法学习对端ARP问题

两台S6900-54QF-F配置三层动态聚合，并配置三层聚合子接口配置IP（端口UP） ，但直连无法互ping成功（聚合口IP可以ping通，聚合子接口IP无法互通），无相关ARP表项等。

配置如下：

设备1

interface Route-Aggregation51

ip address 200.1.1.2 255.255.255.252

link-aggregation mode dynamic

#

interface Route-Aggregation51.3992

ip address 10.191.101.170 255.255.255.252

设备2

interface Route-Aggregation51

ip address 200.1.1.1 255.255.255.252

link-aggregation mode dynamic

#

interface Route-Aggregation51.3992

ip address 10.191.101.169 255.255.255.252

相关三层汇聚子接口无法正常学习到ARP 表项信息。

路由聚合子接口对应的VLAN表的 VLAN_CLASS_ID 被清零了，导致ARP请求无法上送CPU。

[6900-54QT-probe]bcm s 2 c 0 d/chg/vlan/1                                      

VLAN.ipipe0[1]: <VLAN_PROFILE_PTR=1,VLAN_CLASS_ID=2,VALID=1,STG=1,PORT_BITMAP=0x

0000000000022021ffffffffffff,ING_PORT_BITMAP=0x0000000000022021ffffffffffff,FID_

ID=1,EVEN_PARITY_1=1,>

Acl-Type RX IPv4 High, Stage IFP, Pipe 0, Global, Installed, Active            

Prio Mjr/Sub 523/27, Group 16 [16], Slice/Idx 10/4, Entry 25, Double: 3588/3844

Rule Match --------                                                             

         Ports:                                                                

                 0x0000000000000000000000000000000000000000000001fffffffffffffff

ffe                                                                             

                 0x0000000000000000000000000000000000000200000001fffffffffffffff

fff                                                                            

         Lookup: VLAN ID valid[y], STP forwarding, 0x1c, 0x1c                  

         Dest mac: FFFF-FFFF-FFFF, FFFF-FFFF-FFFF                              

         EtherType: 0x806, 0xffff                                              

         SysmRule Index : 29                                                    

         Vlan Class id: 0x2    Mask: 0x2 

前该设备子，直接删除三层汇聚子接口重新建立即可刷新表项，规避该问题。

目前该设备子接口编号和vlan接口相同时，共用vlan。删除一个，vlan class id就会被清掉。用户现场先是建立了VLAN 接口3992 和三层汇聚子接口51.3992，后续删除了3992 的VLAN虚接口，导致vlan class id 被清零，ARP学习出现异常。

后续操作中最好避免类似操作，或者将两者均删除重建。