Hello,
the best thing to do when you want to undestand the meaning of fields of a show command is to use the command reference
here is a link to main 12.3 IOS
http://www.cisco.com/en/US/docs/ios/12_3/iproute/command/reference/ip2_s2g.html#wp1042262
that reports:
Pacing Time Un/Reliable
Pacing time used to determine when EIGRP packets should be sent out the interface (unreliable and reliable packets).
EIGRP has an optimized procedure for managing updates that is called RTP reliable transport protocol that is able to send out a mix of multicast updates with unicast retrasmissions occurring only if needed.
For EIGRP to work an EIGRP router has to track the state of updates for every peer in the segment so there are the queues for each peer.
Here you have a tunnel interface with a single peer on it as could be expected (if not using multipoint GRE).
What is important is to check that the queues of waiting update packets are empty 0/0 and there are no pending routes on the link.
Given that only hello and acknowledge messages are unreliable in EGIRP the first timer tells the pacing frequency for unreliable messages (for example ackhowledges) the second timer (higher) tells the frequency to send out reliable messages likes updates or queries.
The reason for the greater value of the reliable packets is that the protocol has to wait enough time to let all the peers to acknowledge the previous message before moving to the next reliable packet to send
hope to help
Giuseppe
