Issue/Introduction:
TCP/IP and General Networking: when using multiple default gateways and static/RIP routing, if interface is down, then SG switches over to RIP/static route but when the interface is back up it doesn't switch back to the interface route.
Resolution:
This will be fixed in SGOS 5.5.4.1 GA, currently (October 8, 2010) due out in November, 2010. Check the release notes for bug# 142638.
The fix will also be in SGOS 5.4.5.1 GA, currently due out in mid-October, 2010. Check the release notes for b#126775.