Ben Pfaff
37c94b45fd
Before, we tried to use the port configuration bits to implement STP; e.g. if a port was in LISTEN state we turned off sending and receiving frame other than BPDUs. Unfortunately this interacts very badly with in-band control: when the switch connects to the controller, it can be connected to the controller over a port that is not in FORWARD, and so then the controller disabled that port, and the connection eventually dropped when an echo request/reply failed to get through. Now, we implement STP by querying the flows on the switch and killing off the ones that STP does not allow. This works much better because, although we still kill off the in-band control connection, the in-band hook in secchan is then able to resurrect it. --no-stp is still the default since this has not been tested very much.
51 lines
2.1 KiB
C
51 lines
2.1 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#ifndef LEARNING_SWITCH_H
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#define LEARNING_SWITCH_H 1
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#include <stdbool.h>
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struct ofpbuf;
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struct rconn;
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struct lswitch *lswitch_create(struct rconn *, bool learn_macs, int max_idle);
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void lswitch_run(struct lswitch *, struct rconn *);
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void lswitch_wait(struct lswitch *);
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void lswitch_destroy(struct lswitch *);
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void lswitch_process_packet(struct lswitch *, struct rconn *,
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const struct ofpbuf *);
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#endif /* learning-switch.h */
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