Cisco ASR 9000 Series Manuel de configuration - Page 12
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Information About Configuring Serial Interfaces
Before you configure Frame Relay encapsulation on an interface, you must verify that all prior Layer 3
configuration is removed from that interface. For example, you must ensure that there is no IP address
configured directly under the main interface; otherwise, any Frame Relay configuration done under the
main interface will not be viable.
LMI on Frame Relay Interfaces
The Local Management Interface (LMI) protocol monitors the addition, deletion, and status of PVCs.
LMI also verifies the integrity of the link that forms a Frame Relay UNI interface. By default, cisco LMI
is enabled on all PVCs. However, you can modify the default LMI type to be ANSI or Q.933, as
described in the
"Configuring Frame Relay on the Cisco ASR 9000 Series Router"
If the LMI type is cisco (the default LMI type), the maximum number of PVCs that can be supported
under a single interface is related to the MTU size of the main interface. Use the following formula to
calculate the maximum number of PVCs supported on a card or SPA:
The default setting of the mtu command for a serial interface is 1504 bytes. Therefore, the default
Note
numbers of PVCs supported on a serial interface configured with cisco LMI is 186.
Layer 2 Tunnel Protocol Version 3-Based Layer 2 VPN on Frame Relay
The Layer 2 Tunnel Protocol Version 3 (L2TPv3) feature defines the L2TP protocol for tunneling Layer
2 payloads over an IP core network using Layer 2 virtual private networks (VPNs).
L2TPv3 is a tunneling protocol used for transporting Layer 2 protocols. It can operate in a number of
different configurations and tunnel a number of different Layer 2 protocols and connections over a
packet-switched network.
Before you can configure L2TPv3, you need to configure a connection between the two attachment
circuits (ACs) that will host the L2TPv3 psuedowire. Cisco IOS XR software supports a point-to-point,
end-to-end service, where two ACs are connected together.
This module describes how to configure a Layer 2 AC on a Frame Relay encapsulated serial interface.
Serial interfaces support DLCI mode layer 2 ACs only; layer 2 port mode ACs are not supported on serial
Note
interfaces.
For detailed information about configuring L2TPv3 in your network, see the "Implementing Layer 2
Tunnel Protocol Version 3" module of the Cisco IOS XR Virtual Private Network Configuration Guide
for the Cisco CRS Router. For detailed information about configuring L2VPNs, see the "Implementing
MPLS Layer 2 VPNs" module of the Cisco IOS XR Virtual Private Network Configuration Guide for the
Cisco CRS Router.
For detailed information about configuring L2TPv3 in your network, see the "Implementing Layer 2
Tunnel Protocol Version 3 on Cisco IOS XR Software" module of the Cisco IOS XR Virtual Private
Network Configuration Guide for the Cisco XR 12000 Series Router. For detailed information about
configuring L2VPNs, see the "Implementing MPLS Layer 2 VPNs on Cisco IOS XR Software" module
of the Cisco IOS XR Virtual Private Network Configuration Guide for the Cisco XR 12000 Series Router.
Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide
510
"Modifying the Default Frame Relay Configuration on an Interface"
(MTU - 13)/8 = maximum number of PVCs
Configuring Serial Interfaces on the Cisco ASR 9000 Series Router
module in this manual.
section of the
OL-26061-03