trill header extension simplifications
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TRILL Header Extension Simplifications. Donald Eastlake 3 rd Huawei Technologies [email protected]. TRILL Data Frame Format. Link Specific Header. TRILL Header. Header Extensions. Inner Ethernet DA. Inner Ethernet SA. Inner Frame. VLAN Tag. Payload. Link Specific Trailer. - PowerPoint PPT PresentationTRANSCRIPT
TRILL Data Frame Format
2
Link Specific Header
TRILL HeaderInner Ethernet DA
Inner Ethernet SA
Link Specific Trailer
Payload
VLAN Tag
Inne
r F
ram
e
Header Extensions
July 2011
Table of Contents
• Current Header Extensions/Options– draft-ietf-trill-rbridge-options-05.txt
• Proposed Changes• Summary of Proposal
3July 2011
Current TRILL Header
4
Flags OpLen Hops
Nicknames
| | Flags .
TLV Extensions
Critical Summary bits indicate if it is safe for a transit or egress RBridge that does not implement any extensions to process the frame.
Flow ID
More Flags
July 2011
Current Header ExtensionsFirst 32 Bits
• Present if Ext/OpLng in TRILL Header > 0
5
Flow ID, Non-zero if valid
C. H
-b-H
Bits
Critical Hop-by-Hop Summary Bit Critical Ingress-to-Egress Summary Bit
More Extended Flags
Critical Ingress-to-Egress TLV Option Present
Non-Critical Ingress-to-Egress TLV Option Present
Non-Critical Hop-by-Hop TLV Option Present
NC.
H-b
-H B
its
C. I-
t-E
Bits
NC.
I-t-
E Bi
t
Specified in base protocol
Ale
rt
EC
N
July 2011
Current Header ExtensionsSecond 32 Bits
• If “More Extended Flags” bit is a one, there are 4 bytes of additional extended header flags as follows:
Non-CriticalIngress-to-Egress
CriticalIngress-to-Egress
Non-CriticalHop-by-Hop
CriticalHop-by-Hop
6July 2011
Current TLV Format
• Format of TLV Extensions
Value ……..
Length in 4-Byte Units“Type”
Mutable
Non-Critical
Ingress-to-Egress
7July 2011
Table of Contents
• Current Header Extensions/Options• Proposed Changes• Summary of Proposal
8July 2011
Proposed TRILL Header
9
Flags OpLen Hops
Nicknames
| | | | Flags .
TLV Options
Critical Summary bits indicate if it is safe for a transit, egress, or border RBridge that does not implement any extensions to process the frame.
Alert
ECN
July 2011
Proposed Header ExtendedFlag Bits
• Present if Ext/OpLng in TRILL Header > 0
10
C. H
-b-H
Bits
Critical Hop-by-Hop Summary Bit Critical Ingress-to-Egress Summary Bit
Critical Border RBridge Summary Bit
NC.
H-b
-H B
its
C. I-
t-E
Bits
NC.
I-t-
E Bi
t
Specified in base protocol
Ale
rt
July 2011
NC.
Bor
der B
its
C. B
orde
r Bits
ECN
Proposed TLV Format
• Format of TLV Extensions
Value ……..
Length in 4-Byte Units“Type”
MutableNon-Critical
11July 2011
0 – hop-by-hop1 – border RBridge2 – ingress-egress3 – reserved
Table of Contents
• Current Header Extensions/Options• Proposed Changes• Summary of Proposal
12July 2011
Proposed Actions
• Drop Flow-ID Field for now• Drop 2nd 32-bits of Extended Flags• Add “border” summary bit and TLV extension
bit to accommodate possible future extension of TRILL to multi-level
• Issue Working Group Last Call
13July 2011
