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C H A P T E R 12 IP Unicast Routing
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For example, an IP host is configured with a class B address of
100.101.102.103 and a mask of 255.255.0.0:
• The switch is configured with the IP address 100.101.102.1 and a
mask of 255.255.255.0.
• The switch is also configured with a proxy ARP entry of IP
address 100.101.0.0 and mask 255.255.0.0, without the
always
parameter.
• When the IP host tries to communicate with the host at address
100.101.45.67, the IP hosts communicate as if the two hosts are
on the same subnet, and sends out an IP ARP request.
• The switch answers on behalf of the device at address
100.101.45.67, using its own MAC address. All subsequent data
packets from 100.101.102.103 are sent to the switch, and the
switch routes the packets to 100.101.45.67.
Relative Route Priorities
Although these priorities
can be changed, do not
attempt any manipulation
unless you fully
understand the possible
consequences.
Table 12.1 lists the relative priorities assigned to routes depending
on the learned source of the route.
Table 12.1: Relative Route Priorities
Route Origin Priority
Direct 10
BlackHole 50
Static 1100
ICMP 1200
OSPFIntra 2200
OSPFInter 2300
RIP 2400
OSPFExtern1 3200