Motorola DIMETRA MTS 2 Installation, Configuration And Basic Service Manual page 381

MTS 2 and MTS 4 Installation, Configuration and Basic Service Manual
If the counter labeled "Number of discards when disabled" is not zero, this indicates that frame relay
fragmentation is disabled on the Site Controller, but enabled on the remote equipment. If however, there are
non zero values for the counters labeled "Transmit Framed fragmented" and "Number of fragments transmitted"
but the counters labeled "Number of received fragments" and "Number of received frames" are zero, this
would indicate that the remote equipment has not been configured for FRF.20 frame relay fragmentation.
IP and Audio
If - however - all is well with the site link, but there are issues with no uplink or downlink audio, the
likely culprits are either the configuration of the UDP port used for voice, the CRTP configuration
- or both. A quick check can be made for crtp activity by typing status crtp.
SC) status crtp
Compressed Frame Count
Decompressed Frame Count
Contexts Invalidated
Tx Context State Packets
Rx Context State Packets
Tx Full Header Packets
Rx Full Header Packets
Discards when disabled
If the compressed frame count is zero, check the configuration to determine if CRTP is - indeed
- enabled. If the decompressed frame count is zero, check the CRTP configuration on the core
router in order to ensure this is enabled, and not set to "passive"
If - however, the decompressed counter is non zero, it would indicate that the Site Controller is receiving
downlink audio, however - the packets are not getting processed for some other reason. It should then be
determined if the IP layer is discarding the received audio packets - this can be a result of not enabling
header extensions with CRTP on the core router. The command to use is netstat -a.
The section of interest would be the UDP statistics:
UDP datagrams delivered to UDP users
UDP datagrams received for unknown ports
UDP datagrams received with other errors
UDP datagrams sent from this entity
Input datagrams received from interfaces
Drops due to format errors
Drops due to invalid addresses
IP datagrams forwarded
IP datagrams discarded due to unknown protocol
Input datagrams discarded with no problems
Datagrams delivered to IP user-protocols
6802800U74-N September 2009
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IP and Audio
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