Four legs:
1. Anchor WLC to foreign WLC: Copy original IP DSCP to EoIP DSCP
2. Foreign WLC to foreign AP: Statically set DSCP 0 on CAPWAP DSCP; ignore incoming EoIP DSCP
3. Foreign AP to foreign WLC: Map 802.11e UP to CAPWAP per AP/WLC specification
4. Foreign WLC to anchor WLC: Copy original IP DSCP to EoIP DSCP