V7平台交换机的DLDP检测机制与V5平台交换机不同。
V5平台交换机上DLDP实现机制为:链路一端开启DLDP,另一端不开启时,默认全通;
V7平台交换机上DLDP实现机制为:链路一端开启DLDP,另一端不开启时,开启DLDP的一端无法收到对端应答的recovery echo报文,则认为单通。
此区别可能引起的问题是:V7交换机和V5交换机做链路聚合时,当只在V7交换机侧开启DLDP时,链路聚合会变为inactive状态:
[H3CS5820V2-Ten-GigabitEthernet2/0/48]dldp en
[H3CS5820V2-Ten-GigabitEthernet2/0/48]dldp enable
[H3CS5820V2-Ten-GigabitEthernet2/0/48]*Jan 1 01:22:24:604 2011 H3CS5820V2 DLDP/7/TIMER: -Slot=2; Port Ten-GigabitEthernet2/0/48 created a recover-probe timer.
%Jan 1 01:22:24:609 2011 H3CS5820V2 IFNET/5/LINK_UPDOWN: Line protocol on the interface Ten-GigabitEthernet2/0/48 is DOWN.
%Jan 1 01:22:24:615 2011 H3CS5820V2 LAGG/6/LAGG_INACTIVE_PHYSTATE: Member port XGE2/0/48 of aggregation group BAGG5 became inactive, because the physical state of the port is down.
*Jan 1 01:22:26:982 2011 H3CS5820V2 DLDP/7/TIMER: -Slot=2; The recover-probe timer of port Ten-GigabitEthernet2/0/48 timed out.
*Jan 1 01:22:28:982 2011 H3CS5820V2 DLDP/7/TIMER: -Slot=2; The recover-probe timer of port Ten-GigabitEthernet2/0/48 timed out.
*Jan 1 01:22:30:982 2011 H3CS5820V2 DLDP/7/TIMER: -Slot=2; The recover-probe timer of port Ten-GigabitEthernet2/0/48 timed out.
undo debugging all
这是因为V5交换机侧未开启DLDP,V7交换机侧开启DLDP,V7侧收不到recovery echo报文,认为链路单通,聚合成员端口变为unselected的状态。
解决办法是在V5侧也开启DLDP,链路聚合就正常了。
两端都是V5平台交换机在此情况下不会出现该问题。
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