EOS: sum up and compare in/egress throughput

Sometimes you want to compare the ingress/egress throughput on a particular router to see if any possible traffic loss (of course, the loss should be large enough like 3% more).  On EOS, srnz (alias srnz Show interface counters rates | nz) is a good alias. But if incoming or outgoing on multiple ports, you have to sum up and compare.

Here is a couple of useful tips and commands.

bn309#srnz
Port      Name        Intvl   In Mbps      %  In Kpps  Out Mbps      % Out Kpps
Et9/1/1   ixia:LC8     0:05       0.0   0.0%        0   13435.8  35.0%     3543
Et9/2/1   ixia:LC8     0:05       0.0   0.0%        0   13435.3  35.0%     3543
...
Et11/6/1  ixia:LC7     0:05   13433.7  35.0%     3543       0.0   0.0%        0
Et11/11/1 ixia:LC7     0:05   13433.7  35.0%     3543       0.0   0.0%        0
Et11/12/1 ixia:LC7     0:05   13434.6  35.0%     3543       0.0   0.0%        0
Et11/13/1 ixia:LC7     0:05   13432.3  35.0%     3543       0.0   0.0%        0
Et11/14/1 ixia:LC7     0:05   13434.4  35.0%     3543       0.0   0.0%        0
Et11/15/1 ixia:LC7     0:05   13434.3  35.0%     3543       0.0   0.0%        0
Et11/16/1 ixia:LC7     0:05   13433.9  35.0%     3543       0.0   0.0%        0

In the above example, you want to compare ingress from ixia:LC7 and egress of ixia:LC8

bn309#srnz | grep LC7 | awk '{s+=$4}END{print s}'
161206  <<< ingress
bn309#srnz | grep LC8 | awk '{s+=$7}END{print s}'
161198  <<< egress