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Port broadcast suppression default configuration isn't reasonable,S1728G diskless workstation DHCP get address slowly

Publication Date:  2012-09-18 Views:  1054 Downloads:  0
Issue Description
Fault Phenomenon:
S1728G hang diskless workstation ,a large number of DHCP get address very slowly.
S5700(DHCP server)---S1728G---Diskless Workstation
Alarm Information
Handling Process
1、Hang Diskless Workstation on S5700 directly, DHCP get address normally, exclude S5700 issue.
2、view the duplex mode of Diskless Workstation port and the state of S1728G port are all full-duplex, exclude half duplex effect.
3、Packet capturing analysis, found the messages that be discarded are discovery and offer this kind of broadcast messages. View the traffic of S1728G> Storm Control menu, can find all default ports broadcast suppression rates are 64kbps
4、Close S1728G port broadcast suppression, the problem can be solved.
Root Cause
1、S5700 DHCP assignment is busy, results in protocol messages exchange slowly.
2、S1728G and Diskless Workstation port negotiation into half duplex.
3、S1728G port broadcast suppression parameter configuration is not reasonable.
When S1728G site deployment configuration, need to according to the demand of current network, configure broadcast suppression rates. •