10-Gigabit Ethernet Switch Performance Testing - Ixia

4. 10GE OSPF Convergence Test
Objective. Verify the ability of a router to
switch between preferred and lesspreferred
routes on its 10GE ports when
the preferred routes are withdrawn and readvertised.
This will test the control plane
function on the DUT’s 10GE line card.
In this test, two 10GE ports simulate OSPF
routers, Router 1 and Router 2. Both
routers advertise the same route prefixes
to the simulated network. However, the
routes advertised by Router 1 will have
smaller metrics (lower costs), which should
cause the DUT to forward traffic over them
instead of Router 2’s routes. After
advertising the routes, the transmit port
begins transmitting a stream of packets to
an address in each of the advertised route
prefixes. The DUT should forward all the
packets over the route with the lower
metric (Router 1). After a time interval has
Figure 9. 10GE OSPF Convergence Test — setup.
elapsed, the receive port simulating
Router 1 withdraws its routes. The DUT
should detect that the preferred route has
gone down and switch traffic to Router 2’s
routes. Router 1 then re-advertises its
routes. The DUT should again detect a
change re-route traffic to the receive port
simulating Router 1.
Setup. This test uses three test ports — one
to transmit and two to receive (see Figure
9 below). One Ixia test port (acting as the
transmit port) and two Ixia 10GE (test
ports 1 and 2 acting as receive ports)
connect to the DUT. Receive ports will
emulate OSPF routers. The traffic is
unidirectional. The DUT must have three
ports utilized with two enabled for OSPF. All
three ports should be configured for IP and
have unique subnets in which to
communicate with the tester ports.
10-Gigabit Ethernet Switch Performance Testing Copyright © 2004, Ixia 27