TRILL Distributed Layer 3 Gateway
draft-ietf-trill-irb-02
TRILL Working Group W. Hao
INTERNET-DRAFT Y. Li
Intended Status: Standard Track Huawei Technologies
A. Qu
MediaTec
M. Durrani
Brocade
P. Sivamurugan
IP Infusion
L. Xia
Huawei
Technologies
Expires: August 17, 2015 February 17, 2015
TRILL Distributed Layer 3 Gateway
draft-ietf-trill-irb-02.txt
Abstract
Currently TRILL protocol provides optimal pair-wise data frame
forwarding for layer 2 intra-subnet traffic but not for layer 3
inter-subnet traffic. A centralized gateway solution is typically
used for layer 3 inter-subnet traffic forwarding but has following
issues:
1. Sub-optimum forwarding path for inter-subnet traffic.
2. Huge number of gateway interfaces, millions in the extreme
case, need to be supported on the centralized gateway.
3. Traffic bottleneck at the gateway.
An optional TRILL distributed gateway solution that resolves these
centralized gateway issues is specified in this document.
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with
the provisions of BCP 78 and BCP 79.
Hao & Li,etc Expires August 17, 2015 [Page 1]
Internet-Draft TRILL Distributed Layer 3 Gateway February 2015
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Table of Contents
1. Introduction ................................................ 3
2. Conventions used in this document............................ 4
3. Problem Statement ........................................... 5
4. Layer 3 Traffic Forwarding Model............................. 7
5. Distributed Gateway Solution Overview........................ 7
5.1. Local routing information............................... 8
5.2. Local routing information synchronization............... 9
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5.3. Active-active access................................... 10
5.4. Data traffic forwarding process........................ 10
6. Distributed Layer 3 Gateway Process Example................. 11
6.1. Control plane process.................................. 12
6.2. Data plane process..................................... 13
7. TRILL Protocol Extensions................................... 14
7.1. The tenant gateway MAC APPsub-TLV...................... 15
7.2. "SE" Flag in NickFlags APPsub-TLV...................... 15
7.3. The Tenant Label APPsub-TLV............................ 15
7.4. The IPv4 Prefix APPsub-TLV............................. 17
7.5. The IPv6 Prefix APPsub-TLV............................. 18
8. Security Considerations..................................... 18
9. IANA Considerations ........................................ 19
10. Normative References....................................... 19
11. Informative References..................................... 20
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