10-31-2011 08:09 AM - edited 03-07-2019 03:08 AM
Hi,
I have configured a new switch 3560 switch and connected to 4500 switch and formed a trunk connectivity.Now the issue i am facing is when i do a SH CDP NEIGHBOUR from 3560 switch i am able so see 4500 swries switch but at the same time when i do SH CDP NEIGHBOUR form 4500 series switch i am not able to see the entry for 3560 switch.But i am able to telnet the new switch with out any issues.Please someone address this issue immediately...
Thanks,
SATHYA
10-31-2011 08:40 AM
Hi Sathya,
Try enabling debug cdp on the 4500 side and see if you getting packets from 3560. It may show other info as well which ay help.
Thanks,
10-31-2011 08:53 AM
Nikolay,
Both the switches are in production so i dont want to take risk by enabling debug.Please suggest me some other troubleshooting method to fix the issue and also tell me what could be th ecause for this issue.
Thnaks,
SATHYA
10-31-2011 09:30 AM
Hi,
Can you provide the trunk and physical interface configs for both 3560 and 4500?
also, what is the output of "sh cdp nei"?
HTH
10-31-2011 09:33 AM
Hi Sathyasay
Try running sh cdp interfaces on both switchesand check if they are sending out CDP packets.
Kind Regards,
Zee
10-31-2011 09:41 AM
Hi Sathya,
What is the output of "show cdp traffic"?
Best regards,
Alex
10-31-2011 10:17 AM
Hi everyone,
please find the some of the output details.
4500 switch:
OFS-BAN-SW42#sh run int fa7/46
Building configuration...
Current configuration : 135 bytes
!
interface FastEthernet7/46
switchport trunk encapsulation dot1q
switchport mode trunk
speed 100
duplex full
qos trust dscp
end
OFS-BAN-SW42#sh tru
OFS-BAN-SW42#sh trun
OFS-BAN-SW42#sh int tr
OFS-BAN-SW42#sh int tru
OFS-BAN-SW42#sh int trunk
Port Mode Encapsulation Status Native vlan
Fa5/48 on 802.1q trunking 1
Fa7/46 on 802.1q trunking 1
Fa7/48 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa5/48 1-4094
Fa7/46 1-4094
Fa7/48 1-4094
Port Vlans allowed and active in management domain
Fa5/48 1,32,34,42,44,98,100
Fa7/46 1,32,34,42,44,98,100
Fa7/48 1,32,34,42,44,98,100
Port Vlans in spanning tree forwarding state and not pruned
Fa5/48 1,32,34,42,44,98,100
Fa7/46 1,32,34,42,44,98,100
Fa7/48 1,32,34,42,44,98,100
OFS-BAN-SW42#sh int statu
OFS-BAN-SW42#sh int fa7/46 statu
OFS-BAN-SW42#sh int fa7/46 status
Port Name Status Vlan Duplex Speed Type
Fa7/46 connected trunk full 100 10/100BaseTX
OFS-BAN-SW42#sh run int fa7/46
Building configuration...
Current configuration : 135 bytes
!
interface FastEthernet7/46
switchport trunk encapsulation dot1q
switchport mode trunk
speed 100
duplex full
qos trust dscp
end
OFS-BAN-SW42#sh cdp tr
OFS-BAN-SW42#sh cdp traffic ?
| Output modifiers
OFS-BAN-SW42#sh cdp traffic
CDP counters :
Total packets output: 1271444, Input: 1163483
Hdr syntax: 0, Chksum error: 0, Encaps failed: 0
No memory: 0, Invalid packet: 0,
CDP version 1 advertisements output: 0, Input: 0
CDP version 2 advertisements output: 1271444, Input: 1163483
OFS-BAN-SW42#sh cdp in
OFS-BAN-SW42#sh cdp interface fa7/46
FastEthernet7/46 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
OFS-BAN-SW42#
OFS-BAN-SW42#
OFS-BAN-SW42#
OFS-BAN-SW42#sh cdp ne fa7/46
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
OFS-BAN-SW42#
Output from 3560 switch:
OFS-BAN-SW43>sh cdp traffic
CDP counters :
Total packets output: 457, Input: 474
Hdr syntax: 0, Chksum error: 0, Encaps failed: 0
No memory: 0, Invalid packet: 0, Fragmented: 0
CDP version 1 advertisements output: 0, Input: 0
CDP version 2 advertisements output: 457, Input: 474
OFS-BAN-SW43#
OFS-BAN-SW43#sh run int fa0/48
Building configuration...
Current configuration : 160 bytes
!
interface FastEthernet0/48
description "connected to OFS-BAN-SW42"
switchport trunk encapsulation dot1q
switchport mode trunk
speed 100
duplex full
end
OFS-BAN-SW43#sh int fa0/48 statu
OFS-BAN-SW43#sh int fa0/48 status
Port Name Status Vlan Duplex Speed Type
Fa0/48 "connected to OFS- connected trunk full 100 10/100BaseTX
OFS-BAN-SW43#sh cdp int fa0/48
FastEthernet0/48 is up, line protocol is up
Encapsulation ARPA
Sending CDP packets every 60 seconds
Holdtime is 180 seconds
OFS-BAN-SW43#
OFS-BAN-SW43#sh cdp tr
OFS-BAN-SW43#sh cdp traffic ?
| Output modifiers
OFS-BAN-SW43#sh cdp traffic
CDP counters :
Total packets output: 462, Input: 479
Hdr syntax: 0, Chksum error: 0, Encaps failed: 0
No memory: 0, Invalid packet: 0, Fragmented: 0
CDP version 1 advertisements output: 0, Input: 0
CDP version 2 advertisements output: 462, Input: 479
OFS-BAN-SW43#sh cdp ne fa0/48
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
OFS-BAN-SW42.corp.ocwen.com
Fas 0/48 125 R S I WS-C4507R Fas 7/46
OFS-BAN-SW43#sh cdp ne fa0/48 de
-------------------------
Device ID: OFS-BAN-SW42.corp.ocwen.com
Entry address(es):
IP address: 10.131.32.3
Platform: cisco WS-C4507R, Capabilities: Router Switch IGMP
Interface: FastEthernet0/48, Port ID (outgoing port): FastEthernet7/46
Holdtime : 123 sec
Version :
Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-ENTSERVICESK9-M), Version 15.0(2)SG, RELEASE SOFTWARE (fc4
)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Tue 26-Apr-11 15:56 by prod_rel_team
advertisement version: 2
Protocol Hello: OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=00000000FFFFFFFF01022500000000000000000DBCE45FB
FFF0000
VTP Management Domain: ''
Native VLAN: 1
Duplex: full
Management address(es):
IP address: 10.131.32.3
OFS-BAN-SW43#
10-31-2011 11:11 AM
Can you try:
clear cdp table on both devices?
and try sh cdp nei again
11-03-2011 07:28 AM
Reza,
I tried this but it didnt work.Please assist.
11-03-2011 07:44 AM
Hi,
What is sh int f 0/48 trunk on the 3560 saying?
Alain.
11-03-2011 07:51 AM
Please see the output below,
OFS-BAN-SW43>sh int fa0/48 trunk
Port Mode Encapsulation Status Native vlan
Fa0/48 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/48 1-4094
Port Vlans allowed and active in management domain
Fa0/48 1,32,34,42,44
Port Vlans in spanning tree forwarding state and not pruned
Fa0/48 1,32,34,42,44
OFS-BAN-SW43>
11-03-2011 12:05 PM
Hi,
Do you have any access-list blocking multicast addresses?
If not, one thing you can do is to reboot the device during an outage window and see the the result
The last thing I can think of is to try a different revision of the IOS.
HTH
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