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7116509803
RFC 5187 specifies the Graceful Restart enhancement to the OSPFv3
routing protocol. This commit implements support for the GR
restarting mode.
Here's a quick summary of how the GR restarting mode works:
* GR can be enabled on a per-instance basis using the `graceful-restart
[grace-period (1-1800)]` command;
* To perform a graceful shutdown, the `graceful-restart prepare ipv6
ospf` EXEC-level command needs to be issued before restarting the
ospf6d daemon (there's no specific requirement on how the daemon
should be restarted);
* `graceful-restart prepare ospf` will initiate the graceful restart
for all GR-enabled instances by taking the following actions:
o Flooding Grace-LSAs over all interfaces
o Freezing the OSPF routes in the RIB
o Saving the end of the grace period in non-volatile memory (a JSON
file stored in `$frr_statedir`)
* Once ospf6d is started again, it will follow the procedures
described in RFC 3623 until it detects it's time to exit the graceful
restart (either successfully or unsuccessfully).
Testing done:
* New topotest featuring a multi-area OSPF topology (including stub
and NSSA areas);
* Successful interop tests against IOS-XR routers acting as helpers.
Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
82 lines
3.0 KiB
C
82 lines
3.0 KiB
C
/*
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* Copyright (C) 2003 Yasuhiro Ohara
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra 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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* GNU Zebra 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 along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef OSPF6_ZEBRA_H
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#define OSPF6_ZEBRA_H
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#include "zclient.h"
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#define DEFAULT_ROUTE ZEBRA_ROUTE_MAX
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/* Debug option */
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extern unsigned char conf_debug_ospf6_zebra;
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#define OSPF6_DEBUG_ZEBRA_SEND 0x01
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#define OSPF6_DEBUG_ZEBRA_RECV 0x02
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#define OSPF6_DEBUG_ZEBRA_ON(level) (conf_debug_ospf6_zebra |= level)
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#define OSPF6_DEBUG_ZEBRA_OFF(level) (conf_debug_ospf6_zebra &= ~(level))
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#define IS_OSPF6_DEBUG_ZEBRA(e) (conf_debug_ospf6_zebra & OSPF6_DEBUG_ZEBRA_##e)
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/* OSPF6 distance */
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struct ospf6_distance {
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/* Distance value for the IP source prefix */
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uint8_t distance;
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/* Name of the access-list to be matched */
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char *access_list;
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};
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extern struct zclient *zclient;
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struct ospf6;
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extern void ospf6_zebra_route_update_add(struct ospf6_route *request,
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struct ospf6 *ospf6);
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extern void ospf6_zebra_route_update_remove(struct ospf6_route *request,
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struct ospf6 *ospf6);
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extern void ospf6_zebra_redistribute(int, vrf_id_t vrf_id);
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extern void ospf6_zebra_no_redistribute(int, vrf_id_t vrf_id);
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#define ospf6_zebra_is_redistribute(type, vrf_id) \
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vrf_bitmap_check(zclient->redist[AFI_IP6][type], vrf_id)
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extern void ospf6_zebra_init(struct thread_master *tm);
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extern void ospf6_zebra_add_discard(struct ospf6_route *request,
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struct ospf6 *ospf6);
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extern void ospf6_zebra_delete_discard(struct ospf6_route *request,
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struct ospf6 *ospf6);
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extern void ospf6_distance_reset(struct ospf6 *ospf6);
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extern uint8_t ospf6_distance_apply(struct prefix_ipv6 *p,
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struct ospf6_route * or,
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struct ospf6 *ospf6);
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extern int ospf6_zebra_gr_enable(struct ospf6 *ospf6, uint32_t stale_time);
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extern int ospf6_zebra_gr_disable(struct ospf6 *ospf6);
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extern int ospf6_distance_set(struct vty *vty, struct ospf6 *ospf6,
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const char *distance_str, const char *ip_str,
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const char *access_list_str);
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extern int ospf6_distance_unset(struct vty *vty, struct ospf6 *ospf6,
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const char *distance_str, const char *ip_str,
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const char *access_list_str);
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extern int config_write_ospf6_debug_zebra(struct vty *vty);
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extern void install_element_ospf6_debug_zebra(void);
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extern void ospf6_zebra_vrf_register(struct ospf6 *ospf6);
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extern void ospf6_zebra_vrf_deregister(struct ospf6 *ospf6);
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#endif /*OSPF6_ZEBRA_H*/
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