The
Progress of the Network Upgrade
By
Dick Wong
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As mentioned in the previous article on Campus Network
Upgrade ( Ref: Network
Computing Issue 54 - December 2007 ), the University’s
campus network is currently undergoing a major upgrade, from CTNET
III to CTNET IV. The network upgrade consists of 2 phases. Phase
1 of the network upgrade was successfully completed in September
2007. In this phase, the old Gigabit network core was upgraded to
a new 10 Gigabit network core with all the Gigabit Ethernet connections
between the core and distribution layer switches replaced by 10
Gigabit Ethernet links. The switching power of each switch in the
network core was also upgraded from 128 Gbps to 720 Gbps. Apart
from bandwidth upgrade for meeting the increasing network demand,
the new network core will provide the advanced network features
that is indispensible in modern network infrastructure. They include
enhanced QoS, Flex Link, Scavenger Traffic Control, Native IPv6
support in hardware, Network Virtualization, etc, In order to set
up the proper function of the network core and to verify the upgrade
works according to design, over 2,000 access switch ports in some
wiring closets were selected to be upgraded from 10/100 Mbps to
10/100/1000 Mbps for end-user connections.
Phase 2 of the network upgrade has just been started in April
2008. Another 7,000 access switch ports in the remaining wiring
closets will be upgraded to 10/100/1000 Mbps in this phase. The
scope of the work in this phase is so huge that nearly all the
departments in every building will be involved. In order to minimize
the impact on users, the Computing Services Centre (CSC) has arranged
all the tasks that require a partial network shutdown to be performed
at weekends. The CSC appreciates departments’ cooperation and
apologizes for any inconvenience the upgrade may cause. If everything
goes smoothly, this phase would be finished by the end of June
2008. After that, all network connections provided by the CSC
will be able to support up to 1 Gbps. We are confident that, with
the dedication and the experience of the CSC staff, our network
infrastructure will become one of the most advanced and reliable
ones among all universities in the world.
Some facts and figures for the 2-year Campus Network
Upgrade Project include:
- 14 Cisco 6509E Chassis with sup720 in the core
- 56 10 Gigabit Ethernet ports in the core
- 200 1 Gigabit Ethernet ports in the core
- 36 Cisco 3750 access switch with 1Gbps redundant uplinks
- 20 Cisco 6504E (sup32) access switch with 1Gbps redundant
uplinks
- 11 Cisco 6506E (sup32) access switch with 1Gbps redundant
uplinks
- 10 Cisco 6506E (sup32) access switch with 10Gbps redundant
uplinks
- 9 Cisco 6509E (sup32) access switch with 10Gbps redundant
uplinks
- 9000 10/100/1000Mbps Ethernet switch ports installed
- 80 wiring closets
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