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Download complete user manual (PDF). - Brocade

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19<br />

Tunnel statistics for a GRE tunnel or IPv6 <strong>manual</strong> tunnel<br />

system prompts you. Thereafter, when you run any of these three commands to disable or enable a<br />

feature, the system does not prompt. Removing any of the configurations can be done at anytime<br />

and does not necessitate a reload. The new configuration immediately becomes effective, but the<br />

source-ingress CAM partition is removed only upon the next reload.<br />

Operational notes<br />

The subsections that following describe operational characters that relate to the statistics<br />

collection.<br />

Source-ingress-CAM partition<br />

The CAM profile restrictions for this feature are the same as those for the tunnel session<br />

enforce-check configuration. This feature is not supported in those CAM profiles for which the<br />

system cannot allocate the source-ingress-CAM partition that is needed to support the accounting<br />

and session check enforcement. The CLI engine checks for compliance and rejects an attempt to<br />

enable statistics in this situation. Currently the following CAM profiles are not supported for IP<br />

tunnel statistics:<br />

• IPv6<br />

• L2-metro-2<br />

• MPLS-L3VPN-2<br />

• MPLS-VPLS-2<br />

• MPLS-VPN-VPLS<br />

• multi-service-2<br />

• multi-service-3<br />

• multi-service-4<br />

6to4 automatic tunnels<br />

Statistics collection is supported only for <strong>manual</strong> IPv6 and GRE tunnels. The system does not<br />

support statistics collection for 6to4 automatic IPv6 tunnels because, for automatic 6to4 tunnels,<br />

only tunnel source-ip is configured, and the destination is known only at runtime when a remote<br />

node tries to use this tunnel. The destination points can come up or go down without the local<br />

router having any information on how many destinations are to be used for 6to4 tunnels. This<br />

uncertainty can cause scalability issues, so neither statistics collection nor session-enforce check<br />

are not supported for 6to4 automatic tunnels.<br />

Multicast-over-GRE packets<br />

This feature counts multicast over GRE packets. You can see the multicast packet count by using<br />

the show interface tunnel tunnel-id command. You can use other CLI commands to display the<br />

aggregate unicast and multicast statistics for the GRE tunnels. For a description of all the<br />

applicable show commands, refer to “Displaying GRE and <strong>manual</strong> IPv6 tunnel statistics” on<br />

page 834.<br />

710 Multi-Service IronWare Switching Configuration Guide<br />

53-1002820-02

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