HP 6125XLG R2306-HP 6125XLG Blade Switch TRILL Configuration Guide - Page 5

Figure 1 TRILL data frame format Table 1 describes the fields in the TRILL header. Table 1 TRILL header fields Field Ethertype V R M Op-Length Hop Count Egress RB Nickname Ingress RB Nickname Options Description The Ethertype is fixed to TRILL. Version number, which is 0. When an RB receives a TRILL frame, it checks the V field and drops the frame if the V field is not 0. Reserved for future extension. An ingress RB sets the R field to 0 when adding a TRILL header. Transit RBs and egress RBs ignore the field. Multi-destination attribute: • 0-Known unicast frame. • 1-Multicast, broadcast, or unknown unicast frame. Length of the Options field. 0 indicates that the Options field does not exist. Hop count, which is used to avoid loops. An RB drops a TRILL frame whose hop count is decremented to 0. Nickname of the egress RB. Nickname of the ingress RB. Options field. This field exists when the Op-Length field is non-zero. 2