D-Link DGS-3120-48PC Reference Manual page 257

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xStack DGS-3120 Series Managed Switch CLI Reference Guide
DGS-3120-24TC:admin#
Command: show dhcp_relay option_61
Default Relay Rule: 10.90.90.200
Matching Rules:
Client-ID
---------------------- -----------
abc
abcde
00-11-22-33-44-55
Total Entries: 3
DGS-3120-24TC:admin#
show dhcp_relay option_61
Type Relay Rule
----------------
String Drop
String 10.90.90.1
MAC Address Drop
253