Multi-Protocol Label Switching (MPLS) Conform…
2008-02-22 12:37:40来源：互联网 阅读 ()
Results: LDP Extended Martini session capacity.
Figure 11. IxExplorer LDP Extended Martini session scalability test setup
Figure 12. Test results (learned labels)
5. IxScriptMate VPLS MAC Address Cache Capacity Test
Objective: To determine the maximum capacity of a router抯 Layer 2 MAC address cache.
Test setup: A minimum of three Ixia test ports connected to the DUT ?a Test port, a Monitoring port, and a Learning port.
Parameters: Number of PEs per port, number of VPLS instances per CE, number of hosts per VLAN, DUT MAC address table size, DUT MAC address aging time. (See Figure 13.)
Methodology:
- OSPF and LDP are run based on user-configured parameters to set up the network topology and signal the VPLS instances.
- Learning frames, equal in number to the specified DUT MAC address table size, are sent to the Learning port. These frames contain varying source MAC addresses and a fixed destination MAC address corresponding to the address connected to the Test port.
- Validation frames are sent to the Test port back to the addresses learned on the Learning port.
- The Monitoring port listens for flooded or mis-forwarded frames from the DUT.
- A binary search algorithm is used to determine the maximum number of addresses that can be learned without flooding or dropping frames.
Figure 13. IxScriptMate run setup.
Figure 14. IxScriptMate test results.
6. IxExplorer RSVP-TE Fast Reroute Test
Objective: To measure the LSP switchover time of a router running RSVP-TE Fast Reroute between a primary LSP and a detour LSP upon link failure.
Test setup: Three Ixia test ports connected to the DUT ?one acting as the ingress and two as egress (primary and detour). See Figure 15.
Methodology:
- Two bidirectional LSPs are signaled using RSVP-TE through the DUT from the Ixia ingress and egress ports.
- RSVP-TE Fast Reroute objects are signaled to establish one LSP as a primary and the second LSP as a detour.
- Unicast traffic is sent from the ingress port over the primary LSP.
- A switchover to the detour LSP is initiated by bringing down the link to the DUT on the primary LSP.
- Traffic is captured on both the egress ports. The switchover time is calculated by comparing the timestamp of the last packet received on the primary port with the timestamp of the first packet received on the detour port.
Figure 15. IxScriptMate run setup.
Acknowledgements
Authors: Bruce Miller, Elliott Stewart
Glossary Border Gateway Protocol (BGP) An exterior gateway protocol defined in RFC 1267 and RFC 1268. BGP is the principal protocol used along the Internet backbone and within larger organizations. Constraint-Based Routing Routing that uses intelligent path computation and explicit route specification to determine routes. This differs from typical non-Constraint-Based Routing, in which routes are calculated based only on shortest path. Constraint-Based Routing enables traffic engineering in MPLS networks. Class of Service (CoS) Class of Service (CoS) is a method for managing network traffic by grouping similar types of traffic (for example, e-mail, streaming video, voice, large document file transfer) together and treating each type as a class with its own level of service priority. Customer Edge Router (CE) A router at the edge of a customer network, the CE interfaces to a corresponding Provider Edge (PE) router at the edge of the service provider抯 network. Diffserv (Differentiated Services) An architecture for providing different types or levels of service for network traffic. 标签： 版权申明：本站文章部分自网络，如有侵权，请联系：west999com@outlook.com 
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