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Leyland Trucks - Lan refresh
Leyland trucks had in place a medium sized Cisco network consisting of two Cisco 6509 chassisís at the core with multiple switches at the edge. They wished to carry out a LAN refresh in order to improve performance and resilience. To achieve this the core switches were to be replaced with two new Cisco 6509-E models and several existing edge switches were to be de-commissioned and upgraded to Cisco 3750 models.
Leyland trucks operate 24 by 7 and as such making any changes to the core of the network will cause severe disruption. Any changes had to be completed during week-ends when there were scheduled shutdowns.
It also would have had a major business impact if Leyland trucks were unable to access the network outside these operational shutdowns therefore the planning and preparation of this project was of key importance.
Network Design
The current network design at Leyland trucks was provided by the incumbent supplier. The design was to replace the existing Cisco 6509 chassis in the network core with up-rated 6509-E models and for the two chassis to be connected together in a resilient configuration through a 4 Gigabyte Etherchannel Trunk, HSRP and OSPF.
All access nodes, both old and new were connected into the new core. All new/upgraded edge switches were dual homed. Initially these switches were installed in parallel to the existing network until the migration phase was completed.
After the new switches were commissioned the remaining nodes were connected into the Cisco 6509-E using the existing fibre runs. They were disconnected from the old Cisco 6509ís and connected to pre-configured ports on the new Cisco 6509-E switches.
There was no change to the IP subnets already in use or to the VLANs that were already defined. Ports with VLANs mapped on the old network equipment were re-mapped to the new equipment and documented. Also as part of the LAN refresh the UTP cabling was tidied up and documented
Migration Strategy
Prior to the build phase the configuration files for the new switches were pre-prepared. This involved migrating the existing configurations from CATOS to IOS and adding additional parameters.
Part of this task was to ensure the correct re-mapping of port settings from the old switches to the new with particular attention being paid to the speed, duplex, VLAN parameters.
There was sufficient power, space and runs to install the new equipment in parallel to the existing hardware. Both the old and new equipment operated in tandem until the migration of all clients, servers and routers was completed.
Over two week-ends the servers, clients and routers were moved across onto the new switches.
As the new equipment adopted the same IP addresses and VLAN definitions that were already in place on the old equipment, all IP instances on the new equipment were shut down until the migration was completed.
The old and new equipment were connected together through a single Gigabit fibre connection which stayed in place until the migration was completed.

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