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Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 11 Configuring Ethernet Virtual Connections (EVCs)
Understanding EVC Features
When you enter service instance configuration mode, you can configure these options:
• default—Sets a command to its defaults
• description—Adds a service instance specific description
• encapsulation—Configures Ethernet frame match criteria
• errdisable—Configures error disable
• ethernet—Configures Ethernet-lmi parameters
• exit— Exits from service instance configuration mode
• l2protocol—Configures Layer 2 control protocol processing
• mac—Commands for MAC address-based features
• no—Negates a command or sets its defaults
• service-policy —Attaches a policy-map to an EFP
• shutdown—Takes the service instance out of service
Enter the [no] shutdown service-instance configuration mode to shut down or bring up a service
instance.
On a Layer 2 port with no service instance configured, multiple switchport commands are available
(access, backup, block, host, mode, and trunk). When one or more service instances are configured on
a Layer 2 port, no switchport commands are accepted on that interface.
Encapsulation
Encapsulation defines the matching criteria that maps a VLAN, a range of VLANs, cost of service (CoS)
bits, Ethertype, or a combination of these to a service instance. You configure encapsulation in service
instance configuration mode. You must configure one encapsulation command per EFP (service
instance).
Use the encapsulation service-instance configuration mode command to set encapsulation criteria.
Different types of encapsulations are default, dot1q, priority-tagged and untagged. Valid Ethertypes
(type) are ipv4, ipv6, pppoe-all, pppoe-discovery, and pppoe-session.
Encapsulation classification options also include:
• outer tag VLAN
• outer tag CoS
• inner tag VLAN
• inner tag CoS
• payload ethertype—any ethertype tag after the VLAN tag
After you have entered an encapsulation method, these keyword options are available in service instance
configuration mode:
• bridge-domain—Configures a bridge domain
• rewrite—Configures Ethernet rewrite criteria
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