Alcatel-Lucent 7710 SR OS, Interface Configuration Manual

Page: 70 / 436

Port Features
Page 70 7710 SR OS Interface Configuration Guide
Figure 13: MC-APS with ATM VLL Redundancy
In the application show in Figure 13 , 2G and 3G cell sites are aggregated into a Tier 2 or Tier 3
hub site before being backhauled to a Tier 1 site where the radio network controller (RNC) which
terminates user calls is located. This application combines MC-APS on the RNC access side and
pseudowire redundancy and pseudowire switching on the core network side. pseudowire switching
is used in order to separate the routing domains between the access network and the core network.
LAG
Based on the IEEE 802.3ad standard, Link Aggregation Groups (LAGs) can be configured to
increase the bandwidth available between two network devices, depending on the number of links
installed (from 1 to 8). LAG also provides redundancy in the event that one or more links
participating in the LAG fail. All physical links in a given LAG links combine to form one logical
interface.
Packet sequencing must be maintained for any given session. The hashing algorithm deployed by
Alcatel-Lucent routers is based on the type of traffic transported to ensure that all traffic in a flow
remains in sequence while providing effective load sharing across the links in the LAG.
LAGs must be statically configured or formed dynamically with Link Aggregation Control
Protocol (LACP). The optional marker protocol described in IEEE 802.3ad is not implemented.
LAGs can be configured on network andaccess ports.
OSSG145-7710
GSM/GPRS
HSxPA
R99
ATM
Switch
E1 TDM
E1 ATM
E1 IMA ATM
E1 IMA ATM
Or xDSL
IP MPL Core
Layer 3 VPNs
Convergent
Packet Network
RNC Cluster
T-PE
Active/Standby
Pseudo-wire
Multi-chassis
Protection
Pseudo-wire
Segments
T-PE S-PE
7710
7710
PW
PW
7710
PW
7710
7710
PW
PW