IEEE Communications Magazine - June 2017 - page 57

55
IEEE Communications Magazine • June 2017
0163-6804/17/$25.00 © 2017 IEEE
A
bstract
IP address resources work as basic elements
for providing broadband network services. How-
ever, the increase in number, diversity and com-
plexity of modern network devices and services
creates unprecedented challenges for current
manual IP address management. Manually main-
taining IP address resources could always be
sub-optimal for IP resource utilization. Besides,
it requires heavy human efforts from network
operators. To achieve high utilization and flexi-
ble scheduling of IP network address resources,
this article introduces APRIM, an innovative SDN-
based IP address pooling and intelligent manage-
ment system, in which we design a centralized
address management system to realize dynamic
allocation, reclaim, and reallocation of address
blocks for the current BRAS/vBRAS deployment.
We developed a prototype system and evalu-
ated the system based on real-world networks
and users in two provinces from China Telecom.
Experimental results demonstrate that our system
can largely improve the address utilization effi-
ciently and reduce the network resource mainte-
nance workload.
I
ntroduction
As a typical large-scale information network sys-
tem, broadband IP networks contain and main-
tain various resources, including IP address, link
bandwidth, forwarding capacity, cache, ses-
sion resources, and so on, which work as the
basic elements to provide broadband services.
Resource management is one of the key pro-
cesses of network operation. Allocating resourc-
es in a timely manner to meet the needs of
different categories of customers and achieving
global optimal resource allocation efficiency
at the same time within limited resources have
always been the goals of network resource man-
agement.
Meanwhile, network operators are devoting
increasing attention to IP address management,
since IP addresses are the primary resources to
provide connection and services on the broad-
band Internet. In most current cases, the IP
address management system lacks an automat-
ed control mechanism. For instance, the address
system integrated in broadband remote access
servers (BRASs) is configured statically via com-
mand line interface (CLI), and the management
of IP addresses is purely artificial. Network oper-
ators manually allocate IP addresses when they
are exhausted in a BRAS. Some users might have
to wait until new IP blocks are assigned to the
BRAS. Therefore, the timeliness of address alloca-
tion cannot be guaranteed.
Moreover, the increase in number, diversity
and complexity of modern network devices and
services bring new challenges for the manage-
ment of IP addresses in new IP networks.
1. The efficiency of manual assignment is often
sub-optimal. Real-world address resources are
often managed across multiple, partly disconnect-
ed systems. Different systems lack timely inter-
action about the usage of the addresses, leading
to the situation where one network element falls
short of IP addresses while another one possesses
redundant addresses. Manual resource manage-
ment could cause slow scheduling and reduce the
efficiency of resource utilization.
2. The address configuration burden of net-
work operators based on network elements
could be non-trivial and heavy. IP address
resources for various network systems need to
be adjusted quickly due to frequent user and
traffic dynamics. Besides, IPv6 transition tech-
nologies create the need to control and share
addresses among entities. Addresses of differ-
ent network slices should be configured on each
transition instance for high availability (HA) sup-
port. Therefore, resource utilization of network
systems could change very quickly. However, the
current IP address management system depends
on manual management and configuration, and
lacks an open programmable interface for auto-
matic IP resource management, which leads to
a heavy maintenance burden and slow response
to dynamics.
3. Inefficient and trivial manual management
leads to serious fragmentation of IP addresses.
IP address resources no longer consist of large
blocks of consecutive addresses, but a random-
ly scattered set of many small blocks or even
independent individual addresses. The granulari-
ty of the address distribution is often as trivial as
/23, /24. Such fragmentation further decreases
ARPIM: IP Address Resource Pooling and
Intelligent Management System for
Broadband IP Networks
Chongfeng Xie, Jun Bi, Heng Yu, Chen Li, Chen Sun, Qing Liu, Zhilong Zheng, and Shucheng Liu
A
dvances
in
N
etworking
S
oftware
To achieve high utilization
and flexible scheduling
of IP network address
resources, the authors
introduce APRIM, an
innovative SDN-based
IP address pooling and
intelligent management
system, in which they
design a centralized
address management
system to realize dynamic
allocation, reclaim, and
reallocation of address
blocks for the current
BRAS/vBRAS deployment.
Chongfeng Xie, Chen Li, and Qing Liu are with China Telecom Co. Ltd.; Jun Bi, Heng Yu, Chen Sun, and Zhilong Zheng are with Tsinghua University and
Tsinghua National Laboratory for Information Science and Technology.; Shucheng Liu is with Huawei Technologies Co. Ltd.
Digital Object Identifier:
10.1109/MCOM.2017.1601001
1...,47,48,49,50,51,52,53,54,55,56 58,59,60,61,62,63,64,65,66,67,...228
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