{"id":82,"date":"2014-06-27T09:18:46","date_gmt":"2014-06-27T09:18:46","guid":{"rendered":"http:\/\/feralpacket.org\/?p=82"},"modified":"2015-01-03T11:16:23","modified_gmt":"2015-01-03T11:16:23","slug":"v5-written-and-lab-udld-cdp-lldp-notes","status":"publish","type":"post","link":"https:\/\/feralpacket.org\/?p=82","title":{"rendered":"v5 Written and Lab: UDLD, CDP, LLDP Notes"},"content":{"rendered":"

v5 Written:
\n2.1.b Impelment and troubleshoot layer 2 protocols
\n2.1.b [i] CDP, LLDP
\n2.1.b [ii] UDLD<\/code><\/p>\n

v5 Lab:
\n1.1.b Implement and troublshoot layer 2 protocols
\n1.1.b [i] CDP, LLDP
\n1.1.b [ii] UDLD<\/p>\n

Documentation:<\/p>\n

Catalyst 3750-X and 3560-X Softward Configuration Guide, Cisco IOS Release 15.0(1)
\nChapter 28, Configuring CDP, pgs. 28-1 to 28-5<\/p>\n

Catalyst 3750-X and 3560-X Softward Configuration Guide, Cisco IOS Release 15.0(1)
\nChapter 30, Configuring LLDP, LLDP-MED, and Wired Location Service, pgs. 30-1 to 30-12<\/p>\n

Catalyst 3750-X and 3560-X Softward Configuration Guide, Cisco IOS Release 15.0(1)
\nChapter 31, Configuring UDLD, pgs. 31-1 to 31-7<\/p>\n

Books:<\/p>\n

INE:<\/p>\n

Cisco Discovery Protocol (CDP)
\n– runs over Layer 2 (data link layer)
\n– used by all Cisco devices
\n– sends periodic messages to a multicast address
\n– advertises at least one IP address that can receive SNMP messages
\n– advertisements contain time-to-live or holddown information<\/p>\n

Default CDP Configuration
\n– CDP global state: enabled
\n– CDP interface state: enabled
\n– CDP timer: 60 seconds
\n– CDP holdtime: 180 seconds
\n– CDP Version-2 advertisements: enabled<\/p>\n

conf t
\ncdp timer
\ncdp holdtime
\ncdp advertise-v2<\/p>\n

show cdp<\/p>\n

To disable CDP globally:<\/p>\n

conf t
\nno cdp run<\/p>\n

To disable CDP on an interface:<\/p>\n

conf t
\nint fa0\/1
\nno cdp enable<\/p>\n

Monitoring CDP<\/p>\n

clear cdp counters
\nclear cdp table<\/p>\n

show cdp
\nshow cdp entry
\nshow cdp int fa0\/1
\nshow cdp neighbors
\nshow cdp neighbors fa0\/1 detail
\nshow cdp traffic<\/p>\n

Link Layer Discovery Protocol (LLDP)
\n– supports non-Cisco devices and allow interoperability between those devices
\n– neighbor discovery protocol
\n– runs over the data link layer
\n– LLDP attributes are called TLVs (type, length, value descriptions)<\/p>\n

Basic management TLVs:
\n– Port description TLV
\n– System name TLV
\n– System description TLV
\n– System capabilities TLV
\n– Management address TLV<\/p>\n

Default LLDP Configuration
\n– LLDP global state: disabled
\n– LLDP holdtime: 120 seconds
\n– LLDP timer: 30 seconds
\n– LLDP reinitialization delay: 2 seconds
\n– LLDP tlv-select: disabled to send an receive all TLVs
\n– LLDP interface state: disabled
\n– LLDP receive: disabled
\n– LLDP transmit: disabled
\n– LLDP med-tlv-select: disabled to send all LLDP-MED TLVs<\/p>\n

If the interface is configured as a tunnel port, LLDP is automatically disabled<\/p>\n

conf t
\nlldp run<\/p>\n

conf t
\nint fa0\/1
\nlldp transmit
\nlldp receive<\/p>\n

show lldp<\/p>\n

conf t
\nlldp holdtime
\nlldp reinit
\nlldp timer
\nlldp tlv-select
\nlldp med-tlv-select<\/p>\n

show lldp<\/p>\n

LLDP Media Endpoint Discovery (LLDP-MED)
\n– Extension to LLDP that operates between endpoint devices such as IP Phones
\n– Provides support for VOIP applications<\/p>\n

Additional LLDP-MED TLVs:
\n– Port VLAN ID TLV
\n– MAC \/ PHY configuration \/ status TLV
\n– LLDP-MED capabilities TLV
\n– Network policy TLV
\n– Power management TLV
\n– Inventory management TLV
\n– Location TLV<\/p>\n

Monitoring LLDP<\/p>\n

clear lldp counters
\nclear lldp table<\/p>\n

show lldp entry
\nshow lldp interface
\nshow lldp neighbors
\nshow lldp neighbors fa0\/1 detail
\nshow lldp traffic<\/p>\n","protected":false},"excerpt":{"rendered":"

v5 Written: 2.1.b Impelment and troubleshoot layer 2 protocols 2.1.b [i] CDP, LLDP 2.1.b [ii] UDLD v5 Lab: 1.1.b Implement and troublshoot layer 2 protocols 1.1.b [i] CDP, LLDP 1.1.b [ii] UDLD Documentation: Catalyst 3750-X and 3560-X Softward Configuration Guide, Cisco IOS Release 15.0(1) Chapter 28, Configuring CDP, pgs. 28-1 to 28-5 Catalyst 3750-X and […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[30,12,13,11,14],"class_list":["post-82","post","type-post","status-publish","format-standard","hentry","category-ccie","tag-ccie","tag-cdp","tag-lldp","tag-route-switch","tag-udld"],"_links":{"self":[{"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/posts\/82","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/feralpacket.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=82"}],"version-history":[{"count":2,"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/posts\/82\/revisions"}],"predecessor-version":[{"id":226,"href":"https:\/\/feralpacket.org\/index.php?rest_route=\/wp\/v2\/posts\/82\/revisions\/226"}],"wp:attachment":[{"href":"https:\/\/feralpacket.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=82"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/feralpacket.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=82"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/feralpacket.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=82"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}