The default configuration is not reasonable causes S1728G diskless workstation DHCP access the address slowly.

Publication Date:  2012-09-20 Views:  177 Downloads:  0
Issue Description
Fault phenomenon:
Under the S1728G hang diskless workstation, a large number of workstations DHCP access the address very slowly.
Networking:
S5700 (DHCP server) - S1728G - diskless workstation
Alarm Information
None.
Handling Process
1 Hang the diskless workstation in S5700 directly, DHCP access the address normally, eliminate S5700 problems;
2 check diskless workstation’s port duplex mode and S1728G’s port state are full duplex, eliminate half duplex influence;
3 caught analysis found that discard is broadcast message, such as discovery, offer etc. Check S1728G flow, open storm control menu found all the port’s default broadcast inhibition rate is 64 KBPS;
4 The problem will be resolved after close S1728G’s port broadcast inhibition.
Root Cause
1 S5700 DHCP task busy cause protocol message interactive slow;
2 S1728G and diskless workstation port consultation into half duplex;
3 S1728G port broadcast inhibition configuration is not reasonable.
Suggestions
S1728G start configuration need according to now network’s demand configure broadcast inhibition rate reasonably.

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