Vprn Features; Subscriber Interfaces - Alcatel-Lucent 7750 SR OS Service Manual

Service router - mobile gateway

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Table of Contents

VPRN Features

This section describes various of the general 7750 SR service features and any special capabilities

or considerations as they relate to VPRN services.

Subscriber Routed Redundancy Protocol (SRRP) is closely tied to the multi-chassis

synchronization protocol used to synchronize information between redundant nodes. An MCS

peer must be configured and operational when subscriber hosts have a redundant connection to

two nodes. Subscriber hosts are identified by the ingress SAP, the hosts IP and MAC addresses.

Once a host is identified on one node, the MCS peering is used to inform the other node that the

host exists and conveys the dynamic DHCP lease state information of the host. MCS creates a

common association between the virtual ports (SAPs) shared by a subscriber. This association is

configured at the MCS peering level by defining a tag for a port and range of SAPs. The same tag

is defined on the other nodes peering context for another port (does not need to be the same port-

ID) with the same SAP range. In this manner, a subscriber host and Dot1Q tag sent across the

peering with the appropriate tag will be mapped to the redundant SAP on the other node.

Once SRRP is active on the group IP interface, the SRRP instance will attempt to communicate

through in-band (over the group IP interfaces SAPs) and out-of-band (over the group IP interfaces

redundant IP interface) messages to a remote router. If the remote router is also running SRRP

with the same SRRP instance ID, one router will enter a master state while the other router will

enter a backup state. Since both routers are sharing a common SRRP gateway MAC address that is

used for the SRRP gateway IP addresses and for proxy ARP functions, either node may act as the

default gateway for the attached subscriber hosts.

Subscriber Interfaces on page 860

SAPs on page 871

Encapsulations on page 871

QoS Policies on page 872

Filter Policies on page 872

CE to PE Routing Protocols on page 872

PE to PE Tunneling Mechanisms on page 872

Per VRF Route Limiting on page 873

Using OSPF in IP-VPNs on page 873

Spoke SDPs on page 874

Use of Data MDTs on page 876

Multicast Protocols Supported in the Provider Network on page 877

7750 SR OS Services Guide