某局点多级DRNI（M-LAG）互联DR接口DOWN

现场一对S5560交换机（version 7.1.070, Release 6530）与一对S6850（version 7.1.070, Release 6616）交换机多级DRNI互联，组网如下：

display drni summary显示DR接口本地状态为Aggregate interface down，keepalive链路状态正常。 

省略内外端机配置，现场配置如下，查看drni状态发现DR接口状态异常。

Device A配置:

#

interface Bridge-Aggregation2

 port link-type trunk

 port trunk permit vlan all

 link-aggregation mode dynamic

 port drni group 2

#

interface Bridge-Aggregation256

 port link-type trunk

 port trunk permit vlan all

 link-aggregation mode dynamic

 port drni intra-portal-port 1

#

#             

interface GigabitEthernet1/0/48

 port link-mode route

 ip binding vpn-instance keepalive

 ip address 192.168.0.1 255.255.255.252

#

#

interface Ten-GigabitEthernet1/0/49

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 port link-aggregation group 256

#

interface Ten-GigabitEthernet1/0/50

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 port link-aggregation group 256

#

interface Ten-GigabitEthernet1/0/51

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 speed 10000

 port link-aggregation group 2

#

 drni system-mac 0001-0001-0001

 drni system-number 1

 drni system-priority 10

 drni keepalive ip destination 192.168.0.2 source 192.168.0.1 vpn-instance keepalive

 drni mad exclude interface GigabitEthernet1/0/48

#

Device B配置:

#

interface Bridge-Aggregation2

 port link-type trunk

 port trunk permit vlan all

 link-aggregation mode dynamic

 port drni group 2

#

interface Bridge-Aggregation256

 port link-type trunk

 port trunk permit vlan all

 link-aggregation mode dynamic

 port drni intra-portal-port 1

#

#

interface GigabitEthernet1/0/48

 port link-mode route

 ip binding vpn-instance keepalive

 ip address 192.168.0.2 255.255.255.252

#

interface Ten-GigabitEthernet1/0/49

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 port link-aggregation group 256

#

interface Ten-GigabitEthernet1/0/50

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 port link-aggregation group 256

#

interface Ten-GigabitEthernet1/0/51

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 speed 10000

 port link-aggregation group 2

#

 drni system-mac 0001-0001-0001

 drni system-number 2

 drni system-priority 10

 drni keepalive ip destination 192.168.0.1 source 192.168.0.2 vpn-instance keepalive

 drni mad exclude interface GigabitEthernet1/0/48

#

Device C配置:

#

interface Bridge-Aggregation2

 port link-type trunk

 port trunk permit vlan all

 link-aggregation mode dynamic

 port drni group 2

#

interface Bridge-Aggregation256

 port link-type trunk

 port trunk permit vlan all

 link-aggregation mode dynamic

 port drni intra-portal-port 1

 undo mac-address static source-check enable

#

#

interface HundredGigE1/0/25

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 port link-aggregation group 256

#

interface HundredGigE1/0/26

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 port link-aggregation group 256

#

#

interface Twenty-FiveGigE1/0/56

 port link-mode route

 duplex full

 speed 10000

 ip binding vpn-instance keepalive

 ip address 192.168.0.1 255.255.255.252

#

#

interface Twenty-FiveGigE1/0/55

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 speed 10000

 duplex full

 port link-aggregation group 2

#

#

 drni system-mac 0001-0001-0001

 drni system-number 1

 drni system-priority 10

 drni keepalive ip destination 192.168.0.2 source 192.168.0.1 vpn-instance keepalive

 drni mad exclude interface Twenty-FiveGigE1/0/56

#

Device D配置:

#

interface Bridge-Aggregation2

 port link-type trunk

 port trunk permit vlan all

 link-aggregation mode dynamic

 port drni group 2

#

interface Bridge-Aggregation256

 port link-type trunk

 port trunk permit vlan all

 link-aggregation mode dynamic

 port drni intra-portal-port 1

 undo mac-address static source-check enable

#

#

interface HundredGigE1/0/25

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 port link-aggregation group 256

#

interface HundredGigE1/0/26

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 port link-aggregation group 256

#

interface Twenty-FiveGigE1/0/55

 port link-mode bridge

 port link-type trunk

 port trunk permit vlan all

 speed 10000

 duplex full

 port link-aggregation group 2

#

#

 drni system-mac 0001-0001-0001

 drni system-number 2

 drni system-priority 10

 drni keepalive ip destination 192.168.0.1 source 192.168.0.2 vpn-instance keepalive

 drni mad exclude interface Twenty-FiveGigE1/0/56

#

单独看每个DRNI系统配置感觉是没有异常的，虽然DR系统中相互配对的DR接口的系统MAC地址必须相同，但是由于有做DRNI级联，若不同DR系统的系统MAC存在冲突则会影响DR接口状态。

建议用户将系统MAC地址配置为其中一台DR设备的桥MAC地址。

多级DRNI（M-LAG）互联注意DR系统MAC不能存在冲突，建议用户将系统MAC地址配置为其中一台DR设备的桥MAC地址。