There are two routers in redundancy and each has multiple WAN links between two sites.
What is ideal way to configure load sharing. The ethernet of the routers are configured with GLBP. How can the WAN links be load shared. The destination is only one and never changes.
I did a search for bugs on GLBP for release 12.4(9)T I found a few but no one looks like to apply here.
However, two notes:
a) NAT is involved here you have NAT configured on RC and RD
ip nat inside on serial interfaces
but nat is missing on RD GE port, if really missing this is a problem
NAT has its own timers for translations
b) you should track the state of WAN links using weigthing commands (GLBP has a two dimensions criteria priority to choice AVG and weighting for election AVFs) so that if both wan links fail on RC RD will be used
Hope to help