Hi,
We are looking to enable LLDP across our Nexus estate and to disable CDP. As is well known, LLDP does provide greater node information than CDP especially with regards VoIP devices. However, when we enabled LLDP on several 7k VDC's and compared information between the LLDP outputs and CDP outputs we noted that the management IP address details on the LLDP outputs were mac addresses and not IPv4 address format. My question is, is this normal output or is there something we need to configure to correct this. The output from a connected 3560 displays as expected. See the example below:
nexus-a# sh lldp neigh interface e1/25 detail
Capability codes:
(R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
(W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other
Device ID Local Intf Hold-time Capability Port ID
Chassis id: fc5b.3947.5d40
Port id: Eth1/25
Local Port id: Eth1/25
Port Description: *** VPC Peer-Link to nexus-a E1/25 ***
System Name: nexus-b
System Description: Cisco NX-OS(tm) n7700, Software (n7700-s2-dk9), Version 6.2(
16), RELEASE SOFTWARE Copyright (c) 2002-2013 by Cisco Systems, Inc. Compiled 1/
27/2016 9:00:00
Time remaining: 101 seconds
System Capabilities: B, R
Enabled Capabilities: B, R
Management Address: fc5b.3947.5d40
Vlan ID: 1
Total entries displayed: 1
nexus-a#
nexus-aa# sh lldp neigh interface e1/31 detail
Capability codes:
(R) Router, (B) Bridge, (T) Telephone, (C) DOCSIS Cable Device
(W) WLAN Access Point, (P) Repeater, (S) Station, (O) Other
Device ID Local Intf Hold-time Capability Port ID
Chassis id: f07f.06ab.bc80
Port id: Te1/1/4
Local Port id: Eth1/31
Port Description: *** "20Gb Link to NEXUS_A E1/46 ***
System Name: 3650-1
System Description: Cisco IOS Software [Denali], Catalyst L3 Switch Software (CA
T3K_CAA-UNIVERSALK9-M), Version 16.3.10, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2020 by Cisco Systems, Inc.
Compiled Mon 27-Jan-20 09:14 by
Time remaining: 113 seconds
System Capabilities: B, R
Enabled Capabilities: B, R
Management Address: 192.168.141.27
Vlan ID: not advertised
Total entries displayed: 1
nexus-a# sh cdp neigh detail
----------------------------------------
Device ID:nexus-b(JAF1825DDDD)
System Name: nexus-b
Interface address(es):
IPv4 Address: 10.144.169.3
Platform: N77-C7710, Capabilities: Router Switch IGMP Filtering Supports-STP-Dis
pute
Interface: Ethernet1/25, Port ID (outgoing port): Ethernet1/25
Holdtime: 172 sec
Version:
Cisco Nexus Operating System (NX-OS) Software, Version 6.2(16)
Advertisement Version: 2
Native VLAN: 1
Duplex: full
----------------------------------------
Device ID:3650-1
VTP Management Domain Name: null
Interface address(es):
IPv4 Address: 192.168.141.27
Platform: WS-C3650-48PD, Capabilities: Router Switch IGMP Filtering
Interface: Ethernet1/31, Port ID (outgoing port): TenGigabitEthernet1/1/4
Holdtime: 159 sec
Version:
Cisco IOS Software [Denali], Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-
M), Version 16.3.10, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2020 by Cisco Systems, Inc.
Compiled Mon 27-Jan-20 09:14 by mcpre
Advertisement Version: 2
Native VLAN: 3
Duplex: full
Mgmt address(es):
IPv4 Address: 192.168.141.27
----------------------------------------
Although the LLDP outputs are provide better/more information without the IP addresses being displayed we would not be able to disable CDP as the network engineers are very much used to having this information to work with when troubleshooting the network. So, if this is normal behaviour then we will need to have LLDP and CDP enabled.
Any guidance would be appreciated!
Thanks,
Clive Hodgetts
