Monitoring IP Reassembly

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JUNOSe 9.1.x IP Services Configuration Guide > IP Reassembly for Tunnels > Monitoring IP Reassembly
Monitoring IP Reassembly

This section describes how to set a statistics baseline for tunnel reassembly statistics and how to display reassembly statistics.

Setting Statistics Baselines

You can use the baseline ip tunnel-reassembly command to set a statistics baseline for tunnel reassembly statistics on the current virtual router. The router implements the baseline by reading and storing the statistics at the time the baseline is set and then subtracting this baseline whenever you retrieve baseline-relative statistics.

baseline ip tunnel-reassembly
Use to set a statistics baseline for tunnel reassembly statistics on the current virtual router.

To display reassembly statistics relative to the baseline, use the show ip tunnel reassembly statistics command with the delta keyword. For information about displaying baselined statistics, see show ip tunnel reassembly statistics.

Example
host1:vr2#baseline ip tunnel-reassembly
There is no no version.
Displaying Statistics

The router keeps several statistics that are useful for diagnostic purposes. These statistics are organized by virtual router, and some are broken out by protocol as well. You can display statistics for a single virtual router or for all virtual routers. You can also display statistics relative to a baseline.

show ip tunnel reassembly statistics

Use to display tunnel reassembly statistics.

To display statistics in brief form for the current virtual router, use the command with no keywords.

To display statistics for all virtual routers, include the all keyword.

To display detailed statistics, include the detail keyword.

To display statistics relative to a baseline set with the baseline ip tunnel-reassembly command, include the delta keyword.

Field descriptions

Tunnel IP Reassembly—Status of the IP reassembly feature: enabled, disabled

Total Fragments Received—Number of total fragments received for all tunneling protocols

Total Packets Reassembled—Number of packets reassembled; detailed display includes number of packets reassembled for each protocol; Control/Other increments for packets that are reassembled on a Tunnel Service module but are not forwarded, and instead sent to the SRP module

Reassembly Errors or Total Reassembly Errors—Number of errors in completing reassembly; detailed display includes types of reassembly errors

Reassembly Discards—Number of packets discarded because they were not reassembled

Reassembly Disabled Discards—Number of fragmented packets received when IP tunnel reassembly is disabled on the virtual router
Example 1—Shows reassembly statistics for the default virtual router
host1#show ip tunnel reassembly statistics
Tunnel IP Reassembly Statistics for Virtual Router: default
        Tunnel IP Reassembly enabled
        Total Fragments Received:                15
        Total Packets Reassembled:               5
        Reassembly Errors:                       0
        Reassembly Discards:                     0
Example 2—Shows detailed reassembly statistics for the default virtual router
host1#show ip tunnel reassembly statistics detail
Tunnel IP Reassembly Statistics for Virtual Router: default
        Tunnel IP Reassembly enabled
        Total Fragments Received:               15
        Total Packets Reassembled:               5
                L2TP:                            5
                GRE:                             0
                IPSec:                           0
                Control/Other:                   0
        Total Reassembly Errors:                 0
                Fragmentation Errors:            0
                Too Many Fragments:              0
                Out of Resources:                0
                Packet Too Big:                  0
                Reassembly Timeout:              0
        Reassembly Disabled Discards:            0
Example 3—Shows reassembly statistics for virtual router vr2 before and after setting a statistics baseline
The following command shows reassembly statistics for vr2 before setting the baseline.
host1:vr2#show ip tunnel reassembly statistics
Tunnel IP Reassembly Statistics for Virtual Router: vr2
        Tunnel IP Reassembly enabled
        Total Fragments Received:                45
        Total Packets Reassembled:               15
        Reassembly Errors:                       0
        Reassembly Discards:                     0
The following command sets a baseline for reassembly statistics on vr2.
host1:vr2#baseline ip tunnel-reassembly
The following command shows reassembly statistics relative to the baseline before new packets arrive at the router for reassembly.
host1:vr2#show ip tunnel reassembly statistics delta
Tunnel IP Reassembly Statistics for Virtual Router: vr2
        Tunnel IP Reassembly enabled
        Total Fragments Received:                0
        Total Packets Reassembled:               0
        Reassembly Errors:                       0
        Reassembly Discards:                     0
The following command shows reassembly statistics relative to the baseline as new packets start arriving at the router for reassembly.
host1:vr2#show ip tunnel reassembly statistics delta
Tunnel IP Reassembly Statistics for Virtual Router: vr2
        Tunnel IP Reassembly enabled
        Total Fragments Received:                15
        Total Packets Reassembled:               5
        Reassembly Errors:                       0
        Reassembly Discards:                     0

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