#Cisco loopback test ethernet how to#

The traffic then tunnels through a pseudowire over the SP core Traffic from the customer travels over this link to the edge of the SPĬore network. The connection between theĬustomer site and the nearby SP edge router is known as an attachment circuit Technologies, such as Ethernet and Frame Relay. This access network may use a mixture of L2 Typically, a SP uses an access network to connect theĬustomer to the core network. Layer 2 VPNs on Gigabit Ethernet InterfacesĮnables service providers (SPs) to provide L2 services to geographicallyĭisparate customer sites. Introduces Layer 2 Virtual Private Networks (VPNs) and the corresponding Include all information related to circuits and their connections. Requires Provider Edge (PE) routers with the following capabilities:ĭata units (PDU) into Layer 3 (元) packets. While using the service provider resources to establish the network. Service, the service provider does not require information about the customer's Using the data link resources obtained from the service provider. Provider establishes Layer 2 connectivity. Requires coordination between the service provider and customer. Private Network (VPN) emulates a physical sub-network in an IP or MPLS network,īy creating private connections between two points. Configure Ethernet Local Management Interface (E-LMI).Ethernet Local Management Interface (E-LMI).

Configure Link Loss Forwarding for Layer 2 Transport.

Configure Gigabit Ethernet Interfaces for Layer 2 Transport.

Introduction to Layer 2 VPNs on Gigabit Ethernet Interfaces.

Introduction to Layer 2 Virtual Private Networks.

Routers and Layer 2 and Layer 3 switches. To interconnect the router with other systems in POPs, including core and edge Providers to offer high-density, high-bandwidth networking solutions designed Gigabit Ethernet (including 10-Gigabit and 100-Gigabit) architecture andįeatures deliver network scalability and performance, while enabling service SLA: Service level agreement fulfillment: equal to (100 – ES) %.Introduces you to Layer 2 features and standards, and describes how you can.Unavailable seconds (%): Unavailable second (UAS) percentage.SES (%): Aggregated severely errored second (SES) percentage, taking into account all types of error.ES DSCP (%): Accumulated errored second percentage for DSCP.ES delay variation (%): Accumulated errored second percentage for round-trip delay variation.ES delay (%): Accumulated errored second percentage for round-trip delay.ES loss (%): Accumulated errored second percentage for packet loss.ES rate (%): Accumulated errored second percentage for received rate.ES (%): Aggregated errored second (ES) percentage, taking into account all types of error.Misorders: Number of packet misorderings.Average round-trip DV (ms): Average round-trip delay variation.Max round-trip delay (ms): Maximum round-trip delay.Average round-trip delay (ms): Average round-trip delay.Min round-trip delay (ms): Minimum round-trip delay.Rate (Mbit/s): Received Ethernet packet rate.Received packets: Number of Ethernet packets received.

#Cisco loopback test ethernet how to#

The diagram that follows illustrates how the IP addressing in the packet changes in the course of transferring the packet from the Test Agent to the reflector device and back again.īelow is shown how to do the NAT configuration, which is mandatory: In the reflection step, therefore, the source and destination addresses are the same. The destination IP address in the packet sent from Test Agent to reflector is exchanged (according to the IP NAT table) for the Test Agent IP address when the packet is reflected back to the Test Agent.The source IP address in the packet sent from Test Agent to reflector is retained as source IP address when the packet is reflected back to the Test Agent.With this NAT setup, the following happens: Network address translation is then set up using the ip nat inside command. The WAN interface where the traffic enters the router ( GigabitEthernet X in the example below) needs to be defined as the NAT “outside” interface, and a loopback interface ( loopback Y below) needs to be defined as the NAT “inside” interface. In a Cisco router, the network address translation takes place prior to packet forwarding.