What is PFC and DFC?
Policy Feature Card (PFC) Distributed Forwarding Card (DFC) Centralized Forwarding Card (CFC)
What is Cisco PFC?
Priority flow control (PFC; IEEE 802.1bb), which is also referred to as Class-based Flow Control (CBFC) or Per Priority Pause (PPP), is a mechanism that prevents frame loss that is due to congestion. PFC is similar to 802.3x Flow Control (pause frames) or link-level flow control (LFC).
What is a Supervisor Engine in Cisco switch?
A Supervisor Engine is a module that is installed in the Cisco Chassis-based Catalyst Switches or Routers. The supervisor engine contains nearly all the same components of fixed Cisco Switches or Routers.
What is WS F6700 CFC?
WS-F6700-CFC Cisco Catalyst 6500 Central Forwarding Card.
What is DFC line card?
Distributed Forwarding Card (DFC) DFCs are located in linecards, not in Supervisors. A DFC is used to hold a local copy of the forwarding tables (constructed by the MSFC) along with Security and QoS policies to facilitate local switching on the linecard.
How does priority flow control work?
Priority Based Flow Control (PFC) provides an enhancement to the existing pause flow control mechanism as described in 802.1x. When working with lossless traffic, the receiving side sends a pause frame (Xoff) to the transmitting side before the buffer is filled.
What is a sup Cisco?
The supervisor engine is the central forwading intelligence of a modular switch such as the 4500 and 6500 series, and also takes care of the control plane and other functions. Think of it as the “brains” of your switch.
What is a supervisor engine used for?
Benefits of Supervisor Engines The supervisor engine contains the following integrated daughter cards that perform forwarding and routing and provide the protocols supported on the router.
What is CFC in networking?
CFC is a centralized forwarding card for the switching modules which makes IPv4 Routing over the PFC.
What is flow control RX and TX?
RX and TX Enabled: The adapter generates and responds to flow control frames. RX Enabled: The adapter pauses transmission when it receives a flow control frame from a link partner. TX Enabled: The adapter generates a flow control frame when its receive queue reaches a predefined limit.
What is priority and VLAN?
The QoS VLAN Priority lets you assign a priority to outbound packets containing the specified VLAN-ID (VID). Packets containing the specified VID are marked with the priority level configured for the VID classifier. This 802.1 priority determines the outbound port queue to which the packet is sent.
What does a supervisor module do?
The supervisor module is the module that is the brains behind the whole switching operations. Its usually found in chassis based switches, nowadays, it handles everything, including routing and switching (older models had them separated.)
What is supervisor in network?
What is line card in Cisco switch?
What is a Line Card? A Cisco switch line card is a printed circuit board that provides a transmitting/receiving port for a local area network (LAN) or a wide area network (WAN). Cisco line cards plug into telephone switches and routers that have a modular chassis.
What is TCP flow control?
Flow Control in TCP Flow control deals with the amount of data sent to the receiver side without receiving any acknowledgment. It makes sure that the receiver will not be overwhelmed with data. It’s a kind of speed synchronization process between the sender and the receiver.
What is RX & TX enabled?
What does VLAN 0 mean?
The VLAN ID 0 is used when a device needs to send priority-tagged frames but does not know in which particular VLAN it resides. The basic Ethernet frame does not have any priority field. The priority bits, also called CoS bits (Class of Service) are a part of 802.1Q VLAN tag.
Is a line card a switch?
Line cards plug into telephone company switches and high-end routers, which have a modular chassis that accepts a range of cards.
What is meant by line card?
Line card in telecommunications and electronic circuits In telecom systems, a line card (also known as a digital line card) is used to interface the twisted pair cable of a Plain Old Telephone Service (POTS) local loop and the public switched telephone network (PSTN).
What is the 3 way handshake in TCP?
The TCP handshake TCP uses a three-way handshake to establish a reliable connection. The connection is full duplex, and both sides synchronize (SYN) and acknowledge (ACK) each other. The exchange of these four flags is performed in three steps: SYN, SYN-ACK, ACK, as shown in Figure 5.8.