October 2012
Intermediate to advanced
419 pages
10h 47m
English
Content preview from Arista WarriorBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 8. LLDP
Link Layer Discovery Protocol (LLDP) is the open source answer to Cisco’s proprietary Cisco Discovery Protocol (CDP). LLDP is specified in IEEE 802.1AB and is similar to CDP in many ways. Let’s take a look at LLDP in action, and see what you may need to do to make it work with other vendors’ devices.
My Arista 7124S switch is connected to a Cisco 3750. The connection is between G1/0/52 on the 3750 and e24 on the Arista. When I turn up the port, I get the following message on the Arista console:
Apr 10 23:21:35 Arista Lldp: %LLDP-5-NEIGHBOR_NEW: LLDP neighbor with chassisId 001c.b084.cfb4 and portId "[ Arista e24 ]" added on interface Ethernet24
Without configuring anything, the Arista switch has discovered the Cisco switch, even though the Arista switch is not running CDP. Let’s dig in and see what Arista sees:
Arista#sho lldp
LLDP transmit interval : 30 seconds
LLDP transmit holdtime : 120 seconds
LLDP reinitialization delay : 2 seconds
Enabled optional TLVs:
Port Description
System Name
System Description
System Capabilities
Management Address (best)
IEEE802.1 Port VLAN ID
IEEE802.3 Link Aggregation
IEEE802.3 Maximum Frame Size
Port Tx Enabled Rx Enabled
Et1 Yes Yes
Et2 Yes Yes
Et3 Yes Yes
Et4 Yes Yes
Et5 Yes Yes
Et6 Yes Yes
Et7 Yes Yes
Et8 Yes Yes
Et9 Yes Yes
Et10 Yes Yes
Et11 Yes Yes
Et12 Yes Yes
Et13 Yes Yes
Et14 Yes Yes
Et15 Yes Yes
Et16 Yes Yes
Et17 Yes Yes
Et18 Yes Yes
Et19 Yes Yes
Et20 Yes Yes
Et21 Yes Yes
Et22 Yes Yes
Et23 Yes Yes
Et24 Yes YesThat’s pretty ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.