R3#sh cdp neighbors detail
-------------------------
Device ID: R2
Entry address(es):
  IP address: 192.168.0.1
Platform: cisco 2500,  Capabilities: Router
Interface: Serial1,  Port ID (outgoing port): Serial0
Holdtime : 135 sec

Version :
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-I-L), Version 12.3(16), RELEASE SOFTWARE (fc4)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Wed 24-Aug-05 05:13 by ssearch

-------------------------
Device ID: R4
Entry address(es):
  IP address: 192.168.0.6
Platform: cisco 2507,  Capabilities: Router
Interface: Serial0,  Port ID (outgoing port): Serial1
Holdtime : 150 sec

Version :
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IS-L), Version 12.0(28d), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2005 by cisco Systems, Inc.
Compiled Fri 19-Aug-05 19:31 by pwade

R3#