HP 6125XLG Trill Configuration Manual page 5

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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.
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