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October 2012

Switching QoS

The following considerations are based on the Cisco 3560 platform. 1. Enabling QoS By default, QoS is disabled on a switch. You can enable it with: Once QoS is enabled, all incoming packets are assigned a QoS label for internal processing. This QoS label is used for Classification and is …

SNMP and RMON 101

1. SNMP Basics SNMP requires a SNMP Manager (usually a NMS – Network Management System) that sends SNMP requests (get or set) and a SNMP Agent (usually running on the managed device – router, switch) that responds to these requests. The SNMP Agent listens for requests on UDP port 161. …

Logging 101

1. Configuring Logging Logging messages generated by the router are sent to the logging process. It controls the distribution of the messages to various destinations. If the logging process is off, then only the console receives log messages. To enable logging, use: Without this command only the console will receive …

IP Accounting 101

1. Enabling IP Accounting IP Accounting provides statistcs regarding the source and destination of the packets that are switched on an interface. Only outgoing traffic is accounted for and only traffic that is in transit, not generated by the router or that has the router as a destination. IP Accounting …

IP SLA 101

1. About IP SLA IP SLA is a feature that enables a router to monitor the status of a connection by measuring different KPIs. The SLA can be measured end-to-end from one host to another and is independent of the Layer 2 encapsulation. 2. Configuring IP SLA 2.1 Define the …

File Transfer 101 – TFTP & FTP

1. TFTP 1.1 TFTP Server You can use a Cisco Router as a TFTP Server, usually used to serve IOS images to other routers. You can also configure the TFTP client using: 1.2 TFTP Client You can use the router as a TFTP Client using a command like: 2. FTP …

NetFlow 101

1. What is a flow A flow is defined by the combination of the following seven key fields: Source IP address Destination IP address Source port number Destination port number Layer 3 protocol type Type of service (ToS) Input logical interface 2. Gathering information Netflow requires CEF, so before beginning, …

HTTP 101

1. HTTP Server To enable the HTTP Server on the Cisco IOS, use: By default, the server runs on port 80. You can change it with: To restrict the clients that can access the HTTP server, use: To enable authentication for the HTTP server, use: If you use AAA authentication …