Enterprise Infrastructure

Configure DHCP in router cisco

DHCP (Dynamic Host Configuration Protocol)  The DHCP protocol allows clients to dynamically configure network parameters without the need for a manual configuration process.  Dynamically assigns an IP address to the client, subnet mask, default gateway, DNS server, lease time, etc. The four basic DHCP phases: Step 1.- DHCP Discover.- Broadcast message from a client to find a …

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STP Overview

Spanning-Tree Protocol STP is a layer 2 link management protocol that provides redundancy while avoiding network loops. For a layer 2 Ethernet network to function properly, only one active path can exist between two devices (switches). Multiple active paths between devices cause loops in the network. Loops are formed because the parallel switches (or bridges) …

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Etherchannel PAgP y LACP

EtherChannels can be negotiated between two switches, there are two protocols to carry out this negotiation: PAgP and LACP. PAgP (Port Aggregation Protocol) is a Cisco proprietary solution and LACP (Link Aggregation Control Protocol) is based on standards for operation with different manufacturers. All etherchannel member interfaces must be configured with the same protocol on …

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UDLD – UniDirectional Link Detection

UDLD is a Cisco proprietary Layer 2 protocol that monitors the state of a port to validate bidirectional communication. Recall that each port in a swtich is bidirectional, with a transmitter (Tx) and a receiver (Rx) to exchange bits. The switch sends a special frame to the destination mac address 01-00-0C-CC-CC-CC-CC that identifies the device …

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