i followed 
http://documentation.extremenetworks.com/exos/EXOS_All/Getting_Started/r_filtering-the-output-of-sho...
 is the output
X460-24t.5 # show vlan vlan2001  dhcp-address-allocation | include 24
                                                         ^%% Invalid input detected at '^' marker.
Without piping I get
 X460-24t.2 # show vlan vlan2001  dhcp-address-allocation
==============================================================================
IP                MAC                 State      Lease Time Left
==============================================================================
       10.0.0.3   00:24:88:00:0a:b1   Assigned   0001:04:40
       10.0.0.4   00:24:88:00:1d:91   Expired    0000:00:00
       10.0.0.5   00:24:88:00:1a:36   Assigned   0001:47:03
       10.0.0.6   00:24:88:00:1a:31   Assigned   0001:47:29
       10.0.0.7   00:24:88:00:1a:12   Assigned   0001:24:13
       10.0.0.8   00:24:88:00:73:25   Offered    0000:00:00
       10.0.0.9   00:24:88:00:1a:46   Assigned   0001:24:11
      10.0.0.10   00:24:88:00:1a:15   Assigned   0001:47:22
      10.0.0.11   00:24:88:00:72:5f   Assigned   0001:24:06
      10.0.0.12   00:24:88:00:1a:fa   Expired    0000:00:00
      10.0.0.13   00:24:88:00:1a:44   Assigned   0001:51:31
      10.0.0.14   00:24:88:00:15:e3   Expired    0000:00:00
      10.0.0.15   00:24:88:00:1a:58   Assigned   0001:46:44
      10.0.0.16   00:24:88:00:1a:1d   Assigned   0001:47:20
      10.0.0.17   00:24:88:00:13:c8   Assigned   0001:48:28
      10.0.0.18   00:24:88:00:00:2c   Assigned   0001:23:57
      10.0.0.19   00:24:88:00:1b:18   Expired    0000:00:00
      10.0.0.20   00:24:88:00:1a:16   Assigned   0001:24:58
      10.0.0.21   00:24:88:00:02:91   Assigned   0001:12:05
      10.0.0.22   00:24:88:00:72:22   Expired    0000:00:00
Another thing , is there any way to put command output in scrollable block to avoid long looking messages.
(pre and blockquote tag did nothing about enclosing content in a frame) ?
EDIT: Fixed the formatting for you  -Drew C.