- Preface
- Read Me First
- Software Packaging and Architecture
- Using Cisco IOS XE Software
- Console Port, Telnet, and SSH Handling
- Consolidated Packages and Sub-Package Management
- Software Upgrade Process
- High Availability Overview
- Broadband Scalability and Performance
- UniDirectional Link Detection (UDLD) Protocol
- Using the Management Ethernet Interface
- Multilink PPP Support for the ASR 1000 Series Aggregation Services Routers
- Synchronous Ethernet Support
- IEEE 1588v2 PTP Support
- Configuring Bridge Domain Interfaces
- Enabling Support for Tunable DWDM-XFP-C
- Monitoring and Maintaining Multilink Frame Relay
- Configuring MPLS Layer 2 VPNs
- Configuring Support for Management Using the REST API
- LSM-MLDP-based MVPN Support
- Tracing and Trace Management
- Packet Trace
- Configuring and Accessing the Web User Interface
- PPP Half-Bridge on the Cisco ASR 1000 Series Routers
- Unsupported Commands
- Configuration Examples
- Finding Feature Information
- Contents
- Prerequisites for PPP Half-Bridge on the Cisco ASR 1000 Series Routers
- Information About PPP Half-Bridge on the Cisco ASR 1000 Series Routers
- Configuration Examples for PPP Half-Bridge
- Verifying PPP Half-Bridge
- Additional References
- Feature Information for PPP Half-Bridge on the Cisco ASR 1000 Series Routers
PPP Half-Bridge on the Cisco ASR 1000 Series Routers
First Published: December 12, 2014
For situations in which routed network needs connectivity to a remote bridged Ethernet network, a serial or ISDN interface can be configured to function as a PPP half-bridge. The line to the remote bridge functions as a virtual Ethernet interface, and the router's serial or ISDN interface functions as a node on the same Ethernet subnetwork as the remote network.
The PPP full-bridge sends PPP packets to the PPP half-bridge, which converts them to routed packets and forwards them to other router processes. Likewise, the PPP half-bridge converts routed packets to Ethernet bridge packets and sends them to the PPP full-bridge on the same Ethernet subnetwork.
Note
An interface cannot function as both a half-bridge and a full-bridge.
Finding Feature Information
Your software release might not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the “Feature Information for PPP Half-Bridge on the Cisco ASR 1000 Series Routers” section.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Contents
This module contains the following sections:
- Prerequisites for PPP Half-Bridge on the Cisco ASR 1000 Series Routers
- Information About PPP Half-Bridge on the Cisco ASR 1000 Series Routers
- PPP Half-Bridge Supported Features
- Configuration Examples for PPP Half-Bridge
- Verifying PPP Half-Bridge
- Additional References
- Feature Information for PPP Half-Bridge on the Cisco ASR 1000 Series Routers
Prerequisites for PPP Half-Bridge on the Cisco ASR 1000 Series Routers
PPP encapsulation must be enabled under the interface to use PPP half-bridge on ASR 1000 Series Routers.
Information About PPP Half-Bridge on the Cisco ASR 1000 Series Routers
Figure 1 shows a half-bridge configuration. The router port connecting to the bridge is configured as a serial interface to the PPP half-bridge. The interface functions as a virtual node on the Ethernet subnetwork on the bridge. The serial interface has an IP address associated with the Ethernet subnetwork.
Figure 23-1 PPP Half-Bridge Configuration
When a packet destined to the Ethernet arrives at the PPP half-bridge, it is converted to Ethernet packets, encapsulated in PPP frames, and sent on the Ethernet bridge link. The PPP full-bridge decapsulates PPP header, and forwards the Ethernet packet with bridge functionality.
In the reverse direction, PPP half-bridge extracts the Ethernet packets encapsulated in PPP frames that are received from PPP full-bridge device. The PPP half-bridge converts them to IP packets, and routes them on the Internet.
PPP Half-Bridge Supported Features
PPP half-bridge supports the following interworking features:
- VRF aware PPP half bridge interface
- Multicast and VPN Multicast (IGMP V2 and V3) on the PPP half bridge interface
- Routing protocol on the PPP half bridge interface
- IPv4 on the PPP half bridge interface
- ACL on the PPP half bridge interface
- QOS on the PPP half bridge interface
- PPP authentication on the half bridge interface
Configuration Examples for PPP Half-Bridge
Example: Configuring PPP Half-Bridge on the Cisco ASR 1000 Series Routers
The following example shows how to configure PPP Half-Bridge on ASR 1000 Series Routers:
Example: Configuring PPP Full-Bridge on the Cisco 7206 Routers
The following example shows how to emulate the bridge device.
Verifying PPP Half-Bridge
The commands outlined in this section can be used to verify the PPP half-bridge.
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Displays information about the Cisco Express Forwarding adjacency table or the hardware Layer 3-switching adjacency table. |
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The following example displays PPP state information for an interface.
The following example shows the sample output for show adjacency command.
The following example displays information about a serial interface.
Debugging PPP Half-Bridge
The following commands are used to debug PPP half-bridge.
Sample output for debug ppp command
Sample output for debug arp command
Additional References
Related Documents
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Standards
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MIBs
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To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at this URL: |
RFCs
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Technical Assistance
Feature Information for PPP Half-Bridge on the Cisco ASR 1000 Series Routers
Table 23-1 lists the features in this module and provides links to specific configuration information.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.
Note Table 23-1 lists only the software releases that support a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Table 23-1 Feature Information for PPP Half-Bridge on the Cisco ASR 1000 Series Routers
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In Cisco IOS XE Release 3.13.1, the PPP Half-Bridge feature was introduced on the Cisco ASR 1000 Series Router. |
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