Cisco 10000-2P2-2DC Software Guide - Page 155
Monitoring and Maintaining Session Limit Per VRF, Half-Duplex VRF
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Chapter 4 Configuring Multiprotocol Label Switching Half-Duplex VRF Monitoring and Maintaining Session Limit Per VRF To monitor and maintain the session limit Per VRF feature, enter the following commands in privileged EXEC mode: Command Router# show vpdn session [all [interface | tunnel | username] | packets | sequence | state | timers | window] Router# show vpdn Router# show vpdn group name Router# show vpdn history failure Purpose Displays VPDN session information including interface, tunnel, username, packets, status, and window statistics. The options are: • all-All session information for active sessions • all interface-Interface associated to a specific session • all tunnel-Tunnel attribute filter • all username-Username filter • packets-Packet and byte count • sequence-Sequence numbers • state-State of each session • timers-Timer information • window-Window information Displays a summary of all active VPDN tunnels. Displays the session limit set and the number of active sessions and tunnels on the VPDN group you specify. Displays information about VPDN user failures. Half-Duplex VRF The Half-Duplex VRF (HDVRF) feature provides scalable hub and spoke connectivity for subscribers of a multiprotocol label switching-based virtual private network (MPLS VPN) service. These subscribers connect to the provider edge (PE) router of the wholesale service provider, and they use the same or different services (for example, the same or different VRFs). The HDVRF feature prevents local connectivity between subscribers at the spoke PE router and ensures that a hub site provides subscriber connectivity. Any sites that connect to the same PE router must forward intersite traffic using the hub site. This ensures that the routing done at the spoke site is always access side interface to network side interface, or network side interface to access side interface, and never access side to access side. In hub and spoke topologies in which multiple-spoke customer edge (CE) routers, also referred to as spokes, connect to the same PE router, the PE router locally switches the spokes without passing the traffic through the upstream Internet service provider (ISP). In releases earlier than Cisco IOS Release 12.2(16)BX2, when spokes connect to the same PE router, it was necessary to configure each spoke in a separate VRF to ensure that the traffic between the spokes always traverses the central link between the wholesale service provider and the ISP. However, this solution is manageable only if the number of spokes is relatively small. When a large number of spokes are connected to the same PE router, configuring a single VRF for each spoke can become quite complex and can greatly increase memory usage. This is true especially in large-scale wholesale service provider environments that support high-density remote access to Layer 3 VPNs. OL-2226-23 Cisco 10000 Series Router Software Configuration Guide 4-21
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