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router help

burbob burbob is offline
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Join Date: Oct 2007
Posts: 2
Iam learing how to use ios for the cisco exams -- and have a few routers and switchs -- iam new to all this so - and cant work out why i can see the other router ( named it jess ) when i do -show cdp neighbor detail i can see the other router- but when i try and ping the ip address it doesnt work - any ideas - see below

ob>show cdp neighbor detail
Device ID: jess
Entry address(es):
IP address:
Platform: cisco 2516, Capabilities: Router
Interface: FastEthernet0/0, Port ID (outgoing port): Ethernet0
Holdtime : 126 sec

Version :
Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-I-L), Version 11.1(24a), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2001 by cisco Systems, Inc.
Compiled Fri 09-Mar-01 19:43 by pnicosia

advertisement version: 1


Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds:
Success rate is 0 percent (0/5)
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jayesch jayesch is offline
Junior Member
Join Date: Nov 2007
Posts: 8
Basic checks.
1. Check if IP and subnet masks on both the interfaces are configured correctly. They should be in same subnet CDP works on layer 2 so you will still see the other router. Layer 3 connectivity is verified by using ping.
2. Check port speed and duplex mode configuration. You can also check the LEDs on the port. They should be green and blinking. Although this should not be a problem if CDP is discovered but nonethless you might want to check still.
3. Finally check for any access-list blocking ICMP.
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