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Zorluk: OrtaLayer 2 Discovery Protocols (CDP and LLDP)

A network engineer is integrating non-Cisco VoIP endpoints and access points into an existing Cisco Catalyst switch infrastructure. The engineer needs to ensure automated VLAN assignment and power negotiation function properly across the multi-vendor environment while maintaining Layer 2 discovery. Which two statements regarding the operation and configuration of CDP and LLDP in this scenario are correct?

  1. LLDP-MED (Media Endpoint Discovery) is an IEEE 802.1AB extension that enables detailed power management, location identification, and automated voice VLAN policy discovery between network switches and IP endpoints.Cevap
  2. CDP and LLDP operate as completely independent processes, allowing both protocols to run concurrently on the same interface without interfering with each other's neighbor tables.Cevap
  3. C
    Executing the interface configuration command 'no lldp transmit' automatically disables the processing and reception of incoming LLDP frames on that interface.
  4. D
    CDP automatically reformats its frame headers to conform to IEEE 802.1AB standards when an interface detects a non-Cisco neighbor device.

Cevap

The two correct statements state that LLDP-MED is an IEEE 802.1AB extension enabling automated endpoint discovery features like voice VLAN policy assignment and power management, and that CDP and LLDP operate independently as separate protocols on the same interface.
LLDP-MED enhances standard IEEE 802.1AB by defining specific Type-Length-Value (TLV) fields for voice VLAN policy, location, and PoE management when connecting third-party endpoints. Additionally, CDP and LLDP are completely decoupled protocol stacks within Cisco IOS, running concurrently without mutual interference.

Adım Adım Çözüm

1
Evaluate the capabilities of LLDP-MED in multi-vendor endpoint deployments.
Identified that LLDP-MED (Media Endpoint Discovery) is designed to supply Voice VLAN network policies, location info, and PoE details to multi-vendor devices.
Standard LLDP provides basic device discovery, whereas LLDP-MED extends IEEE 802.1AB for media endpoints such as IP phones.
2
Analyze protocol independence between CDP and LLDP.
Confirmed that Cisco IOS handles CDP (Cisco proprietary) and LLDP (IEEE standard) as separate internal processes.
Both protocols can simultaneously build their respective neighbor tables ('show cdp neighbors' and 'show lldp neighbors') on a shared interface.
3
Inspect interface command behavior for LLDP transmission and reception.
Disproved the claim that disabling transmit disables receive.
In Cisco IOS, 'lldp transmit' and 'lldp receive' are distinct granular interface commands.
4
Evaluate CDP framing standards.
Disproved the claim that CDP changes to IEEE 802.1AB.
CDP remains Cisco-proprietary regardless of connected neighbor devices.

Anahtar Kavram

CDP and LLDP Protocol Differences and Multi-Vendor Operations
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Konular

Layer 2 Discovery Protocols (CDP and LLDP)

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