Operational notes, Source-ingress-cam partition, 6to4 automatic tunnels – Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) User Manual
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Multi-Service IronWare Switching Configuration Guide
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Tunnel statistics for a GRE tunnel or IPv6 manual tunnel
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system prompts you. Thereafter, when you run any of these three commands to disable or enable a
feature, the system does not prompt. Removing any of the configurations can be done at anytime
and does not necessitate a reload. The new configuration immediately becomes effective, but the
source-ingress CAM partition is removed only upon the next reload.
Operational notes
The subsections that following describe operational characters that relate to the statistics
collection.
Source-ingress-CAM partition
The CAM profile restrictions for this feature are the same as those for the tunnel session
enforce-check configuration. This feature is not supported in those CAM profiles for which the
system cannot allocate the source-ingress-CAM partition that is needed to support the accounting
and session check enforcement. The CLI engine checks for compliance and rejects an attempt to
enable statistics in this situation. Currently the following CAM profiles are not supported for IP
tunnel statistics:
•
IPv6
•
L2-metro-2
•
MPLS-L3VPN-2
•
MPLS-VPLS-2
•
MPLS-VPN-VPLS
•
multi-service-2
•
multi-service-3
•
multi-service-4
6to4 automatic tunnels
Statistics collection is supported only for manual IPv6 and GRE tunnels. The system does not
support statistics collection for 6to4 automatic IPv6 tunnels because, for automatic 6to4 tunnels,
only tunnel source-ip is configured, and the destination is known only at runtime when a remote
node tries to use this tunnel. The destination points can come up or go down without the local
router having any information on how many destinations are to be used for 6to4 tunnels. This
uncertainty can cause scalability issues, so neither statistics collection nor session-enforce check
are not supported for 6to4 automatic tunnels.
Multicast-over-GRE packets
This feature counts multicast over GRE packets. You can see the multicast packet count by using
the show interface tunnel tunnel-id command. You can use other CLI commands to display the
aggregate unicast and multicast statistics for the GRE tunnels. For a description of all the
applicable show commands, refer to