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11 Using Policy Based Routing and Access Control Lists in a Virtualized Network
3 Example 2 – Server Priority
Ensure server traffic is routed across a higher bandwidth and given the highest priority. Consider the
following example where it is assumed traditional routing is already enabled and configured.
It is critical that an organization’s primary database server on VLAN 30 is backed up across the network
every Thursday morning at 1:00 AM, while using only the larger bandwidth path on the network (Figure 2).
The switch that routes this traffic for the server can use PBR.
NAS storage device
Database Server
10G path
1
G path
Switch A Switch B
N3048
192.150.2.1192.151.3.1
192.151.3.5
192.150.2.5
Using Policy Based Routing for Server Priority Figure 2.
An access list is created to determine the IP address to filter, set a priority queue, and set the time and
duration for when the PBR will take effect. The route-map then routes all packets from the specified IP
address over the larger bandwidth path during the time specified.
The following commands on the Dell Networking N3048 assign the highest COS queue to the server from
1:00 AM to 5:00 AM every Thursday morning, and then routes its traffic across the higher cost, larger
bandwidth path (switch B).