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74e2bd891d
DF (Designated forwarder) election is used for picking a single
BUM-traffic forwarded per-ES. RFC7432 specifies a mechanism called
service carving for DF election. However that mechanism has many
disadvantages -
1. LBs poorly.
2. Doesn't allow for a controlled failover needed in upgrade
scenarios.
3. Not easy to hw accelerate.
To fix the poor performance of service carving alternate DF mechanisms
have been proposed via the following drafts -
draft-ietf-bess-evpn-df-election-framework
draft-ietf-bess-evpn-pref-df
This commit adds support for the pref-df election mechanism which
is used as the default. Other mechanisms including service-carving
may be added later.
In this mechanism one switch on an ES is elected as DF based on the
preference value; higher preference wins with IP address acting
as the tie-breaker (lower-IP wins if pref value is the same).
Sample output
=============
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
torm-11# sh bgp l2vpn evpn es 03:00:00:00:00:01:11:00:00:01
ESI: 03:00:00:00:00:01:11:00:00:01
Type: LR
RD: 27.0.0.15:6
Originator-IP: 27.0.0.15
Local ES DF preference: 100
VNI Count: 10
Remote VNI Count: 10
Inconsistent VNI VTEP Count: 0
Inconsistencies: -
VTEPs:
27.0.0.16 flags: EA df_alg: preference df_pref: 32767
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
torm-11# sh bgp l2vpn evpn route esi 03:00:00:00:00:01:11:00:00:01
*> [4]:[03:00:00:00:00:01:11:00:00:01]:[32]:[27.0.0.15]
27.0.0.15 32768 i
ET:8 ES-Import-Rt:00:00:00:00:01:11 DF: (alg: 2, pref: 100)
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* VxLAN common header.
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* Copyright (C) 2016, 2017 Cumulus Networks, Inc.
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*
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* This file is part of FRR.
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*
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* FRR is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* FRR is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with FRR; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef __VXLAN_H__
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#define __VXLAN_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* EVPN MH DF election alogorithm */
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#define EVPN_MH_DF_ALG_SERVICE_CARVING 0
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#define EVPN_MH_DF_ALG_HRW 1
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#define EVPN_MH_DF_ALG_PREF 2
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/* preference range for DF election */
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#define EVPN_MH_DF_PREF_MIN 0
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#define EVPN_MH_DF_PREF_DEFAULT 32767
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#define EVPN_MH_DF_PREF_MAX 65535
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/* VxLAN Network Identifier - 24-bit (RFC 7348) */
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typedef uint32_t vni_t;
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#define VNI_MAX 16777215 /* (2^24 - 1) */
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/* Flooding mechanisms for BUM packets. */
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/* Currently supported mechanisms are head-end (ingress) replication
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* (which is the default) and no flooding. Future options could be
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* using PIM-SM, PIM-Bidir etc.
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*/
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enum vxlan_flood_control {
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VXLAN_FLOOD_HEAD_END_REPL = 0,
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VXLAN_FLOOD_DISABLED,
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VXLAN_FLOOD_PIM_SM,
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};
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#ifdef __cplusplus
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}
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#endif
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#endif /* __VXLAN_H__ */
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