Table Of Contents

Configuring Ethernet Over Soft GRE

Finding Feature Information

Contents

Information About Ethernet Over Soft GRE

Supported Features

Prerequisites for Ethernet Over GRE

Configuring Ethernet Over GRE

Example: Two-Box Deployment Model

Additional References

Related Documents

Standards

Feature Information for Configuring Ethernet Over Soft GRE

Configuring Ethernet Over Soft GRE

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First Published: Noverber 28, 2012

Last Updated: March 28, 2013

Generic Routing Encapsulation (GRE) is a tunneling protocol that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an IP internetwork.

Ethernet over soft GRE is a new aggregation solution for aggregating WiFi traffic from hotspots. This solution enables customer premises equipment (CPE) devices to bridge the Ethernet traffic from the end host, and encapsulate the packages through the Ethernet traffic into an IP GRE tunnel as a source tunnel endpoint. When the IP GRE tunnels are terminated on a service provider broadband network gateway, the end hosts' traffic is terminated and the subscriber session initiated for the end hosts.

Figure 1 shows the structure of the Ethernet over soft GRE.

Figure 1 Ethernet over Soft GRE

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest information about features and caveats, see the release notes document pertaining to your platform and software release. To find information about the features documented in this module and to view a list of the releases in which each feature is supported, see the "Feature Information for Configuring Ethernet Over Soft GRE" section.

Use the Cisco Feature Navigator to find information about platform support and Cisco IOS and Cisco Catalyst operating system software image support. To access the Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Information About Ethernet Over Soft GRE

•Prerequisites for Ethernet Over GRE

•Configuring Ethernet Over GRE

•Additional References

•Feature Information for Configuring Ethernet Over Soft GRE

Information About Ethernet Over Soft GRE

The Cisco ASR 1000 Series Aggregation Services Routers serve as the service provider broadband network gateway that:

•Terminates IP GRE tunnels.

•Manages the subscriber session for end-host clients.

Two models have been introduced in the context of the Ethernet over GRE feature:

•One-box integrated model—the Cisco ASR 1000 Series Aggregation Services Routers can terminate the bridged Ethernet over soft GRE traffic and manage a subscriber session as an Intelligent Services Gateway (ISG).

•Two-box model—the Cisco ASR 1000 Series Aggregation Services Routers can only terminate the bridged Ethernet over soft GRE traffic. An external router, which serves as an ISG subscriber management, is connected to a Cisco ASR 1000 Series Aggregation Services Router through the L2 bridge domain.

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Note For now, Cisco IOS XE Release 3.8 supports only the two-box model on the Cisco ASR 1000 Series Aggregation Services Routers.

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Figure 2 shows the structure of the Ethernet over soft GRE feature on the Cisco ASR 1000 Series Aggregation Services Routers.

Figure 2 Ethernet over Soft GRE on the Cisco ASR 1000 Series Aggregation Services Routers

Supported Features

The following features are supported on the Cisco ASR 1000 Series Aggregation Services Routers:

•Ethernet over GRE traffic termination on the router

•Transport—IPv4

•Frames can have up to one dot1Q VLAN tag

•L2-connected IPv4 or IPv6 mobile nodes

•External ISG

•High Availability (RP or FP SSO)

•Mobile client move

•128 K mobile clients or CPE

Prerequisites for Ethernet Over GRE

Before you configure the Ethernet over GRE feature on the Cisco ASR 1000 Series Aggregation Services Routers, ensure that the following prerequisites are met:

•The virtual Ethernet interface is enabled.

•An Ethernet service instance is configured under the virtual Ethernet interface.

Configuring Ethernet Over GRE

To enable the virtual Ethernet interface, perform the following steps:

SUMMARY STEPS

1. enable

2. configure terminal

3. interface virtual-ethernet virtual-ethernet interface number

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables the privileged EXEC mode. Enter your password, if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters the global configuration mode.
Step 3	interface virtual-ethernet virtual-ethernet interface number Example: Router# interface virtual-ethernet 1	Enables the virtual Ethernet interface.

To configure the Ethernet service instance under the virtual Ethernet interface, perform the following steps:

SUMMARY STEPS

1. enable

2. configure terminal

3. interface virtual-ethernet virtual-ethernet interface number

4. service instance service instance number ethernet

5. encapsulation dot1q vlan-id

6. rewrite ingress tag pop 1 symmetric

7. bridge-domain vlan-id

DETAILED STEPS

	Command or Action	Purpose
Step 1	enable Example: Router> enable	Enables the privileged EXEC mode. Enter your password, if prompted.
Step 2	configure terminal Example: Router# configure terminal	Enters the global configuration mode.
Step 3	interface virtual-ethernet virtual-ethernet interface number Example: Router# interface virtual-ethernet 1	Enables the virtual Ethernet interface.
Step 4	service instance service instance number ethernet Example: Router(config-if)# service instance 1 ethernet	Configures an Ethernet service instance on the virtual Ethernet interface.
Step 5	encapsulation dot1q vlan-id Example: encapsulation dot1q 100	Enables IEEE 802.1Q encapsulation of traffic on a specified subinterface in a VLAN.
Step 6	rewrite ingress tag pop 1 symmetric Example: Router(config-if)# rewrite ingress tag pop 1 symmetric	Specifies the outermost tag for removal from a packet and the encapsulation reciprocal adjustment to be performed in the egress direction on a frame ingressing a service instance.
Step 7	bridge-domain vlan-id Example: Router(config-if)# bridge-domain 10	Binds the service instance to a bridge domain instance.

Example: Two-Box Deployment Model

The following example shows the configuration of the Ethernet over GRE feature for the two-box deployment model:

Interface Virtual-Ethernet 1

    service instance 1 ethernet

       encapsulation dot1q 100

       rewrite ingress tag pop 1 symmetric

       bridge-domain 10

Interface Gi1/0/0

     service instance 1 ethernet

       encapsulation dot1q 100

       rewrite ingress tag pop 1 symmetric

       bridge-domain 10

!

Additional References

The following sections provide references related to the features.

Related Documents

Related Topic	Document Title
Cisco IOS commands	Cisco IOS Master Commands List, All Releases
Cisco IOS Configuration Fundamentals	Cisco IOS Configuration Fundamentals Command Reference

Standards

Standard	Title
No new or modified standards are supported by this feature.	—

Feature Information for Configuring Ethernet Over Soft GRE

Table 1 lists the features in this module and provides links to specific configuration information. Only features that were introduced or modified in Cisco IOS Release 3.8.0S or a later release appear in the table.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the corresponding command reference documentation.

Use the Cisco Feature Navigator to find information about platform support and software image support. The Cisco Feature Navigator enables you to determine which Cisco IOS and Cisco Catalyst operating system software images support a specific software release, feature set, or platform. To access the Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 1 Feature Information for Configuring Ethernet Over Soft GRE

Feature Name	Releases	Feature Information
Ethernet Over Soft GRE	3.8.0S	Ethernet over soft GRE is a new aggregation solution for aggregating WiFi traffic from hotspots. In this solution, customer premises equipment (CPE) device bridges the Ethernet traffic from the end host, and encapsulates the packages through the Ethernet traffic into an IP GRE tunnel as a source tunnel endpoint. When the IP GRE tunnels are terminated on a service provider broadband network gateway, the end hosts' traffic will be terminated and the subscriber session initiated for the end hosts. In Cisco IOS XE Release 3.8.0S, this feature was implemented on the ASR 1000 Series Aggregation Services Routers. The following sections provide information about this feature: •Information About Ethernet Over Soft GRE •Configuring Ethernet Over GRE

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