Multi-Protocol Label Switching (MPLS) Conform…

Methodology: IxANVL runs a number of test cases against the DUT based on direct interpretation of the LDP RFCs 3036 and 3215.

1. Configure each IxANVL network interface with the appropriate network parameters, including those of the DUT such as IP address, MAC address, gateway, etc.
2. Specify configuration of the DUT, typically via command scripts such as Expect scripts.
3. Select the set of IxANVL LDP test cases to run during the test session (see Figure 7).
4. Run IxANVL in batch mode with the command scripts, reconfiguring the DUT as required between test cases to match the IxANVL test setup.

Results: Number of tests passed/failed, including reasons for failed cases (see Figure 8).



Figure 7. IxANVL LDP test cases.



Figure 8. IxANVL LDP test results.

2. IxScriptMate L2 VPN Partial Mesh

Performance Test

Objective: To determine the maximum rate an LSR configured as an L2 VPN PE router can 損ush?MPLS labels onto incoming Layer 2 packets and forward the resulting MPLS traffic, or 損op?labels from incoming MPLS packets and forward the resulting Layer 2 traffic with no loss.

Test setup: Minimum of two Ixia ports connected to the DUT ?one to simulate a PE router and another to simulate a CE router. Additional ports can be configured to emulate multiple PEs/CEs (see Figure 9). The IxScriptMate application, running on a workstation, controls the test running on Ixia hardware.

Parameters: Number of PEs/CEs, number of VCs per PE, VC distribution style (consecutive or round robin), frame size distribution, traffic transmission rate.

Methodology:

1. Each Ixia port simulating a PE router establishes an OSPF session, LDP session, and Extended LDP (Martini) session with the DUT.
2. If more than one Ixia port is being used to simulate PE routers, the VC IDs can be distributed among them in either round robin or consecutive fashion.
3. The CE and/or PE ports transmit traffic at the specified rate. If frame loss occurs, the transmission rate is alternately reduced/increased using a binary search algorithm to determine the maximum rate at which the DUT can forward traffic without loss

Results: Frame loss, latency, data errors, sequence errors.



Figure 9. Test setup

3. IxScriptMate L3 VPN RSVP-TE Egress Performance

Objective: To determine the maximum rate an LER configured as an L3 VPN PE router can 損op?MPLS labels from incoming packets and forward the resulting IP traffic with no loss.

Test setup: Two Ixia ports connected to the DUT ?one to simulate a PE and P router and another to simulate a CE router (see Figure 10).

Parameters: OSPF parameters, BGP parameters, number of routes per CE, frame size distribution, traffic transmission rate.

Methodology:

1. The port simulating the PE/P router establishes an OSPF session with the DUT and advertises the loopback address of the simulated PE router. Traffic engineering parameters are advertised using OSPF-TE.
2. Bidirectional LSPs are established using RSVP-TE.
3. A Multi-Protocol internal BGP (MP璱BGP) session is established with the DUT.
4. The port simulating the PE router transmits MPLS traffic at the specified rate. If frame loss occurs, the transmission rate is alternately reduced/increased using a binary search algorithm to determine the maximum rate at which the DUT can forward traffic without loss.

Results: Transmit rate, latency, data errors, sequence errors.



Figure 10. IxScriptMate L3 VPN RSVP-TE egress performance.

4. IxExplorer LDP Extended Martini Session Scalability Test

Objective: To determine the maximum number of LDP Extended Martini sessions the DUT can sustain at one time. Test setup: One Ixia port connected to the DUT (see Figure 11).

Methodology:

1. An OSPF session is established with the DUT.
2. An LDP basic session is established with the DUT, advertising the Ixia port loopback address as a FEC.
3. A number of LDP Extended Martini sessions (based on test expectations) are established with the DUT with one or more Layer 2 VC FECs advertised per session.
4. Status on the port is monitored to determine if all configured sessions are successfully established. Figure 14 shows the MPLS Martini labels learned by IxExplorer from the DUT ?one for each session.
5. If all sessions are successfully established, the number of extended sessions configured is increased and the test rerun. If not all are established, the number of sessions is lowered and the test repeated.

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