Routed Bridge Encapsulation with ATM Virtual Circuit Bundles

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The following restrictions apply to the Routed Bridge Encapsulation with ATM Virtual Circuit Bundles feature:

• RBE over switched virtual circuit (SVC) bundles is not supported.
• SVC bundle member selection based on QoS groups is not supported.
• Fast switching is not supported (only Cisco Express Forwarding switching and process switching are supported).
• PVC bundle member selection based on QoS groups does not support distributed platforms.
• PVC bundle member selection based on QoS groups does not support bumping, protection, or PVC bundle incompleteness detection.

PVC bundles are supported under the following conditions (numbers are maximum per interface and per router):

• 1000 PVC bundles with AAL5 LLC/SNAP encapsulation, and each PVC bundle with four PVC bundle members
• 800 PVC bundles with two members each and with AAL5 LLC/SNAP encapsulation, and interfaces with 4000 PVCs overall (including PVC bundle members)

• Benefits of Routed Bridge Encapsulation with ATM Virtual Circuit Bundles
• Memory Impact of Routed Bridge Encapsulation with ATM Virtual Circuit Bundles
• Performance Impact of Routed Bridge Encapsulation with ATM Virtual Circuit Bundles

• Specifying the Method for Selecting PVC Bundle Members
• Configuring the QoS Group-Based Method for Selection of PVC Bundle Members
• Configuring Explicit Inverse ARP PVC Selection for QoS Group-Based PVC Bundle Member Selection
• Verifying Routed Bridge Encapsulation with ATM Virtual Circuit Bundles

• Specifying the Method for Selecting PVC Bundle Members Example
• Configuring the QoS Group-Based Method for Selection of PVC Bundle Members Example
• Configuring Explicit Inverse ARP PVC Selection for QoS Group-Based PVC Bundle Member Selection Example

interface atm 2/0
 bundle cisco
  selection-method qos-group
  end

interface atm 2/0
 bundle cisco
  selection-method qos-group
  pvc 35/56
  qos-group 1
  end

interface atm 2/0
 bundle cisco
  selection-method qos-group
  pvc 1/32
  qos-group 1
  inarp-vc
  end

ARP --Address Resolution Protocol. Internet protocol used to map an IP address to a MAC address. Defined in RFC 826.

ATM --Asynchronous Transfer Mode. The international standard for cell relay in which multiple service types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take advantage of high-speed transmission media, such as E3, SONET, and T3.

bundle --A logical grouping of one or more physical interfaces using the formats and procedures of multilink Frame Relay. A bundle emulates a physical interface to the Frame Relay data link layer. The bundle is also referred to as the MFR interface .

Cisco Express Forwarding --Layer 3 IP switching technology that optimizes network performance and scalability for networks with large and dynamic traffic patterns.

fast switching --Cisco feature in which a route cache expedites packet switching through a router.

Inverse ARP --Inverse Address Resolution Protocol (ARP). Method of building dynamic routes in a network. Allows an access server to discover the network address of a device associated with a virtual circuit.

MPLS --Multiprotocol Label Switching. Switching method that forwards IP traffic using a label. This label instructs the routers and the switches in the network where to forward the packets based on preestablished IP routing information.

MQC --modular QoS command-line interface (CLI). A CLI structure that lets you create traffic polices and attach them to interfaces. A traffic policy contains a traffic class and one or more QoS features. A traffic class is used to classify traffic, and the QoS features in the traffic policy determine how to treat the classified traffic.

PVC --permanent virtual circuit (or connection). Virtual circuit that is permanently established. PVCs save bandwidth associated with circuit establishment and teardown in situations where certain virtual circuits must exist all the time. In ATM terminology, this is called a permanent virtual connection.

QoS --quality of service. Measure of performance for a transmission system that reflects its transmission quality and service availability.

RBE --routed bridge encapsulation. Process by which a stub-bridged segment is terminated on a point-to-point routed interface. Specifically, the router is routing on an IEEE 802.3 or Ethernet header carried over a point-to-point protocol, such as PPP, RFC 1483 ATM, or RFC 1490 Frame Relay.

SVC --switched virtual circuit. Virtual circuit that is dynamically established on demand and is torn down when transmission is complete. SVCs are used in situations where data transmission is sporadic. Called a switched virtual connection in ATM terminology.

ToS --type of service byte. Second byte in the IP header that indicates the desired quality of service for a specific datagram.

VC --virtual circuit. Logical circuit created to ensure reliable communication between two network devices. A VC is defined by a VPI/VCI pair and can be either permanent or switched.