Source: ../../ospf/ospf.hh
|
|
|
|
// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-
// vim:set sts=4 ts=8:
// Copyright (c) 2001-2009 XORP, Inc.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License, Version 2, June
// 1991 as published by the Free Software Foundation. Redistribution
// and/or modification of this program under the terms of any other
// version of the GNU General Public License is not permitted.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For more details,
// see the GNU General Public License, Version 2, a copy of which can be
// found in the XORP LICENSE.gpl file.
//
// XORP Inc, 2953 Bunker Hill Lane, Suite 204, Santa Clara, CA 95054, USA;
// http://xorp.net
// $XORP: xorp/ospf/ospf.hh,v 1.116 2009/01/05 18:31:01 jtc Exp $
#ifndef __OSPF_OSPF_HH__
#define __OSPF_OSPF_HH__
/**
* OSPF Types
*/
struct OspfTypes {
/**
* The OSPF version.
*/
enum Version {V2 = 2, V3 = 3};
/**
* The type of an OSPF packet.
*/
typedef uint16_t Type;
/**
* Router ID.
*/
typedef uint32_t RouterID;
/**
* Area ID.
*/
typedef uint32_t AreaID;
/**
* Link Type
*/
enum LinkType {
PointToPoint,
BROADCAST,
NBMA,
PointToMultiPoint,
VirtualLink
};
/**
* Authentication type: OSPFv2 standard header.
*/
typedef uint16_t AuType;
static const AuType NULL_AUTHENTICATION = 0;
static const AuType SIMPLE_PASSWORD = 1;
static const AuType CRYPTOGRAPHIC_AUTHENTICATION = 2;
/**
* Area Type
*/
enum AreaType {
NORMAL, // Normal Area
STUB, // Stub Area
NSSA, // Not-So-Stubby Area
};
/**
* Routing Entry Type.
*/
enum VertexType {
Router,
Network
};
/**
* NSSA Translator Role.
*/
enum NSSATranslatorRole {
ALWAYS,
CANDIDATE
};
/**
* NSSA Translator State.
*/
enum NSSATranslatorState {
ENABLED,
ELECTED,
DISABLED,
};
/**
* The AreaID for the backbone area.
*/
static const AreaID BACKBONE = 0;
/**
* An opaque handle that identifies a peer.
*/
typedef uint32_t PeerID;
/**
* An opaque handle that identifies a neighbour.
*/
typedef uint32_t NeighbourID;
/**
* The IP protocol number used by OSPF.
*/
static const uint16_t IP_PROTOCOL_NUMBER = 89;
/**
* An identifier meaning all peers. No single peer can have this
* identifier.
*/
static const PeerID ALLPEERS = 0;
/**
* An identifier meaning all neighbours. No single neighbour can
* have this identifier.
*/
static const NeighbourID ALLNEIGHBOURS = 0;
/**
* An interface ID that will never be allocated OSPFv3 only.
*/
static const uint32_t UNUSED_INTERFACE_ID = 0;
/**
*
* The maximum time between distinct originations of any particular
* LSA. If the LS age field of one of the router's self-originated
* LSAs reaches the value LSRefreshTime, a new instance of the LSA
* is originated, even though the contents of the LSA (apart from
* the LSA header) will be the same. The value of LSRefreshTime is
* set to 30 minutes.
*/
static const uint32_t LSRefreshTime = 30 * 60;
/**
* The minimum time between distinct originations of any particular
* LSA. The value of MinLSInterval is set to 5 seconds.
*/
static const uint32_t MinLSInterval = 5;
/**
* For any particular LSA, the minimum time that must elapse
* between reception of new LSA instances during flooding. LSA
* instances received at higher frequencies are discarded. The
* value of MinLSArrival is set to 1 second.
*/
static const uint32_t MinLSArrival = 1;
/**
* The maximum age that an LSA can attain. When an LSA's LS age
* field reaches MaxAge, it is reflooded in an attempt to flush the
* LSA from the routing domain. LSAs of age MaxAge
* are not used in the routing table calculation. The value of
* MaxAge is set to 1 hour.
*/
static const uint32_t MaxAge = 60 * 60;
/**
* When the age of an LSA in the link state database hits a
* multiple of CheckAge, the LSA's checksum is verified. An
* incorrect checksum at this time indicates a serious error. The
* value of CheckAge is set to 5 minutes.
*/
static const uint32_t CheckAge = 5 * 60;
/*
* The maximum time dispersion that can occur, as an LSA is flooded
* throughout the AS. Most of this time is accounted for by the
* LSAs sitting on router output queues (and therefore not aging)
* during the flooding process. The value of MaxAgeDiff is set to
* 15 minutes.
*/
static const int32_t MaxAgeDiff = 15 * 60;
/*
* The metric value indicating that the destination described by an
* LSA is unreachable. Used in summary-LSAs and AS-external-LSAs as
* an alternative to premature aging. It is
* defined to be the 24-bit binary value of all ones: 0xffffff.
*/
static const uint32_t LSInfinity = 0xffffff;
/*
* The Destination ID that indicates the default route. This route
* is used when no other matching routing table entry can be found.
* The default destination can only be advertised in AS-external-
* LSAs and in stub areas' type 3 summary-LSAs. Its value is the
* IP address 0.0.0.0. Its associated Network Mask is also always
* 0.0.0.0.
*/
static const uint32_t DefaultDestination = 0;
/*
* The value used for LS Sequence Number when originating the first
* instance of any LSA.
*/
static const int32_t InitialSequenceNumber = 0x80000001;
/*
* The maximum value that LS Sequence Number can attain.
*/
static const int32_t MaxSequenceNumber = 0x7fffffff;
};
/**
* Interface name of a virtual link endpoint.
*/
static const char VLINK[] = "vlink";
/**
* MTU of a virtual link.
*/
static const uint32_t VLINK_MTU = 576;
/**
* XRL target name.
*/
static const char TARGET_OSPFv2[] = "ospfv2";
static const char TARGET_OSPFv3[] = "ospfv3";
/**
* Get the XRL target name.
*/
inline
const char *
xrl_target(OspfTypes::Version version)
{
switch (version) {
case OspfTypes::V2:
return TARGET_OSPFv2;
break;
case OspfTypes::V3:
return TARGET_OSPFv3;
break;
}
XLOG_UNREACHABLE();
}
/**
* Pretty print a router or area ID.
*/
inline
string
pr_id(uint32_t id)
{
return IPv4(htonl(id)).str();
}
/**
* Set a router or area ID using dot notation: "128.16.64.16".
*/
inline
uint32_t
set_id(const char *addr)
{
return ntohl(IPv4(addr).addr());
}
/**
* Pretty print the link type.
*/
inline
string
pp_link_type(OspfTypes::LinkType link_type)
{
switch(link_type) {
case OspfTypes::PointToPoint:
return "PointToPoint";
case OspfTypes::BROADCAST:
return "BROADCAST";
case OspfTypes::NBMA:
return "NBMA";
case OspfTypes::PointToMultiPoint:
return "PointToMultiPoint";
case OspfTypes::VirtualLink:
return "VirtualLink";
}
XLOG_UNREACHABLE();
}
/**
* Convert from a string to the type of area
*/
inline
OspfTypes::LinkType
from_string_to_link_type(const string& type, bool& status)
{
status = true;
if (type == "p2p")
return OspfTypes::PointToPoint;
else if (type == "broadcast")
return OspfTypes::BROADCAST;
else if (type == "nbma")
return OspfTypes::NBMA;
else if (type == "p2m")
return OspfTypes::PointToMultiPoint;
else if (type == "vlink")
return OspfTypes::VirtualLink;
XLOG_WARNING("Unable to match %s", type.c_str());
status = false;
return OspfTypes::BROADCAST;
}
/**
* Pretty print the area type.
*/
inline
string
pp_area_type(OspfTypes::AreaType area_type)
{
switch(area_type) {
case OspfTypes::NORMAL:
return "NORMAL";
case OspfTypes::STUB:
return "STUB";
case OspfTypes::NSSA:
return "NSSA";
}
XLOG_UNREACHABLE();
}
/**
* Convert from a string to the type of area
*/
inline
OspfTypes::AreaType
from_string_to_area_type(const string& type, bool& status)
{
status = true;
if (type == "normal")
return OspfTypes::NORMAL;
else if (type == "stub")
return OspfTypes::STUB;
else if (type == "nssa")
return OspfTypes::NSSA;
XLOG_WARNING("Unable to match %s", type.c_str());
status = false;
return OspfTypes::NORMAL;
}
/**
* Router ID and associated interface ID.
*/
struct RouterInfo {
RouterInfo(OspfTypes::RouterID router_id)
: _router_id(router_id), _interface_id(0)
{}
RouterInfo(OspfTypes::RouterID router_id, uint32_t interface_id)
: _router_id(router_id), _interface_id(interface_id)
{}
OspfTypes::RouterID _router_id; // Neighbour Router ID.
uint32_t _interface_id; // Neighbour interface ID OSPFv3 only.
};
/**
* Neighbour information that is returned by XRLs.
*/
struct NeighbourInfo {
string _address; // Address of neighbour.
string _interface; // Interface name.
string _state; // The current state.
IPv4 _rid; // The neighbours router id.
uint32_t _priority; // The priority in the hello packet.
uint32_t _deadtime; // Number of seconds before the
// peering is considered down.
IPv4 _area; // The area this neighbour belongs to.
uint32_t _opt; // The options on the hello packet.
IPv4 _dr; // The designated router.
IPv4 _bdr; // The backup designated router.
uint32_t _up; // Time there has been neighbour awareness.
uint32_t _adjacent; // Time peering has been adjacent.
};
/**
* OSPFv3 only, the information stored about an interface address.
*/
template <typename A>
struct AddressInfo {
AddressInfo(A address, uint32_t prefix = 0, bool enabled = false)
: _address(address), _prefix(prefix), _enabled(enabled)
{}
bool operator<(const AddressInfo<A>& other) const {
return _address < other._address;
}
A _address; // The address.
uint32_t _prefix; // Prefix length associated with this address.
bool _enabled; // True if the address should be used.
};
#include "policy_varrw.hh"
#include "io.hh"
#include "exceptions.hh"
#include "lsa.hh"
#include "packet.hh"
#include "transmit.hh"
#include "peer_manager.hh"
#include "external.hh"
#include "vlink.hh"
#include "routing_table.hh"
#include "trace.hh"
template <typename A>
class Ospf {
public:
Ospf(OspfTypes::Version version, EventLoop& eventloop, IO<A>* io);
/**
* @return version of OSPF this implementation represents.
*/
OspfTypes::Version version() { return _version; }
/**
* @return true if ospf should still be running.
*/
bool running() { return _io->status() != SERVICE_SHUTDOWN; }
/**
* Status of process.
*/
ProcessStatus status(string& reason) {
if (PROC_STARTUP == _process_status) {
if (SERVICE_RUNNING == _io->status()) {
_process_status = PROC_READY;
_reason = "Running";
}
}
reason = _reason;
return _process_status;
}
/**
* Shutdown OSPF.
*/
void shutdown() {
_io->shutdown();
_reason = "shutting down";
_process_status = PROC_SHUTDOWN;
}
/**
* Used to send traffic on the IO interface.
*/
bool transmit(const string& interface, const string& vif,
A dst, A src, int ttl, uint8_t* data, uint32_t len);
/**
* The callback method that is called when data arrives on the IO
* interface.
*/
void receive(const string& interface, const string& vif,
A dst, A src, uint8_t* data, uint32_t len);
/**
* Enable the interface/vif to receive frames.
*/
bool enable_interface_vif(const string& interface, const string& vif);
/**
* Disable this interface/vif from receiving frames.
*/
bool disable_interface_vif(const string& interface, const string& vif);
/**
* Is this interface/vif enabled?
* This is a question asked of the FEA, has the interface/vif been
* marked as up.
*
* @return true if it is.
*/
bool enabled(const string& interface, const string& vif);
/**
* Is this interface/vif/address enabled?
* This is a question asked of the FEA, has the interface/vif been
* marked as up.
*
* @return true if it is.
*/
bool enabled(const string& interface, const string& vif, A address);
/**
* Add a callback for tracking the interface/vif status.
*
* The callback will be invoked whenever the status of the tuple
* (interface, vif) is changed from disabled to enabled
* or vice-versa.
*
* @param cb the callback to register.
*/
void register_vif_status(typename IO<A>::VifStatusCb cb) {
_io->register_vif_status(cb);
}
/**
* Add a callback for tracking the interface/vif/address status.
*
* The callback will be invoked whenever the status of the tuple
* (interface, vif, address) is changed from disabled to enabled
* or vice-versa.
*
* @param cb the callback to register.
*/
void register_address_status(typename IO<A>::AddressStatusCb cb) {
_io->register_address_status(cb);
}
/**
* Get all addresses associated with this interface/vif.
*
* @param interface the name of the interface
* @param vif the name of the vif
* @param addresses (out argument) list of associated addresses
*
* @return true if there are no errors.
*/
bool get_addresses(const string& interface, const string& vif,
list<A>& addresses) const;
/**
* Get a link local address for this interface/vif if available.
*
* @param interface the name of the interface
* @param vif the name of the vif
* @param address (out argument) set if address is found.
*
* @return true if a link local address is available.
*
*/
bool get_link_local_address(const string& interface, const string& vif,
A& address);
/**
* Get the interface ID required for OSPFv3.
* The vif argument is required for virtual links.
*/
bool get_interface_id(const string& interface, const string& vif,
uint32_t& interface_id);
/**
* Given an interface ID return the interface and vif.
*/
bool get_interface_vif_by_interface_id(uint32_t interface_id,
string& interface, string& vif);
/**
* @return prefix length for this address.
*/
bool get_prefix_length(const string& interface, const string& vif,
A address, uint16_t& prefix_length);
/**
* @return the mtu for this interface.
*/
uint32_t get_mtu(const string& interface);
/**
* On the interface/vif join this multicast group.
*/
bool join_multicast_group(const string& interface, const string& vif,
A mcast);
/**
* On the interface/vif leave this multicast group.
*/
bool leave_multicast_group(const string& interface, const string& vif,
A mcast);
/**
* Set the hello interval in seconds.
*/
bool set_hello_interval(const string& interface, const string& vif,
OspfTypes::AreaID area,
uint16_t hello_interval);
#if 0
/**
* Set options.
*/
bool set_options(const string& interface, const string& vif,
OspfTypes::AreaID area,
uint32_t options);
#endif
/**
* Create a virtual link
*
* @param rid neighbours router ID.
*/
bool create_virtual_link(OspfTypes::RouterID rid);
/**
* Delete a virtual link
*
* @param rid neighbours router ID.
*/
bool delete_virtual_link(OspfTypes::RouterID rid);
/**
* Attach this transit area to the neighbours router ID.
*/
bool transit_area_virtual_link(OspfTypes::RouterID rid,
OspfTypes::AreaID transit_area);
/**
* Set router priority.
*/
bool set_router_priority(const string& interface, const string& vif,
OspfTypes::AreaID area,
uint8_t priority);
/**
* Set the router dead interval in seconds.
*/
bool set_router_dead_interval(const string& interface, const string& vif,
OspfTypes::AreaID area,
uint32_t router_dead_interval);
/**
* Set the interface cost.
*/
bool set_interface_cost(const string& interface, const string& vif,
OspfTypes::AreaID area,
uint16_t interface_cost);
/**
* Set the RxmtInterval.
*/
bool set_retransmit_interval(const string& interface, const string& vif,
OspfTypes::AreaID area,
uint16_t retransmit_interval);
/**
* Set InfTransDelay
*/
bool set_inftransdelay(const string& interface, const string& vif,
OspfTypes::AreaID area,
uint16_t inftransdelay);
/**
* Set a simple password authentication key.
*
* Note that the current authentication handler is replaced with
* a simple password authentication handler.
*
* @param interface the interface name.
* @param vif the vif name.
* @param area the area ID.
* @param password the password to set.
* @param the error message (if error).
* @return true on success, otherwise false.
*/
bool set_simple_authentication_key(const string& interface,
const string& vif,
OspfTypes::AreaID area,
const string& password,
string& error_msg);
/**
* Delete a simple password authentication key.
*
* Note that after the deletion the simple password authentication
* handler is replaced with a Null authentication handler.
*
* @param interface the interface name.
* @param vif the vif name.
* @param area the area ID.
* @param the error message (if error).
* @return true on success, otherwise false.
*/
bool delete_simple_authentication_key(const string& interface,
const string& vif,
OspfTypes::AreaID area,
string& error_msg);
/**
* Set an MD5 authentication key.
*
* Note that the current authentication handler is replaced with
* an MD5 authentication handler.
*
* @param interface the interface name.
* @param vif the vif name.
* @param area the area ID.
* @param key_id unique ID associated with key.
* @param password phrase used for MD5 digest computation.
* @param start_timeval start time when key becomes valid.
* @param end_timeval end time when key becomes invalid.
* @param max_time_drift the maximum time drift among all routers.
* @param the error message (if error).
* @return true on success, otherwise false.
*/
bool set_md5_authentication_key(const string& interface, const string& vif,
OspfTypes::AreaID area, uint8_t key_id,
const string& password,
const TimeVal& start_timeval,
const TimeVal& end_timeval,
const TimeVal& max_time_drift,
string& error_msg);
/**
* Delete an MD5 authentication key.
*
* Note that after the deletion if there are no more valid MD5 keys,
* the MD5 authentication handler is replaced with a Null authentication
* handler.
*
* @param interface the interface name.
* @param vif the vif name.
* @param area the area ID.
* @param key_id the ID of the key to delete.
* @param the error message (if error).
* @return true on success, otherwise false.
*/
bool delete_md5_authentication_key(const string& interface,
const string& vif,
OspfTypes::AreaID area, uint8_t key_id,
string& error_msg);
/**
* Toggle the passive status of an interface.
*/
bool set_passive(const string& interface, const string& vif,
OspfTypes::AreaID area,
bool passive, bool host);
/**
* If this is a "stub" or "nssa" area toggle the sending of a default
* route.
*/
bool originate_default_route(OspfTypes::AreaID area, bool enable);
/**
* Set the StubDefaultCost, the default cost sent in a default route in a
* "stub" or "nssa" area.
*/
bool stub_default_cost(OspfTypes::AreaID area, uint32_t cost);
/**
* Toggle the sending of summaries into "stub" or "nssa" areas.
*/
bool summaries(OspfTypes::AreaID area, bool enable);
/**
* Send router alerts in IP packets or not.
*/
bool set_ip_router_alert(bool alert);
/**
* Add area range.
*/
bool area_range_add(OspfTypes::AreaID area, IPNet<A> net, bool advertise);
/**
* Delete area range.
*/
bool area_range_delete(OspfTypes::AreaID area, IPNet<A> net);
/**
* Change the advertised state of this area.
*/
bool area_range_change_state(OspfTypes::AreaID area, IPNet<A> net,
bool advertise);
/**
* Get a single lsa from an area. A stateless mechanism to get LSAs. The
* client of this interface should start from zero and continue to request
* LSAs (incrementing index) until toohigh becomes true.
*
* @param area database that is being searched.
* @param index into database starting from 0.
* @param valid true if a LSA has been returned. Some index values do not
* contain LSAs. This should not be considered an error.
* @param toohigh true if no more LSA exist after this index.
* @param self if true this LSA was originated by this router.
* @param lsa if valid is true the LSA at index.
*/
bool get_lsa(const OspfTypes::AreaID area, const uint32_t index,
bool& valid, bool& toohigh, bool& self, vector<uint8_t>& lsa);
/**
* Get a list of all the configured areas.
*/
bool get_area_list(list<OspfTypes::AreaID>& areas) const;
/**
* Get a list of all the neighbours.
*/
bool get_neighbour_list(list<OspfTypes::NeighbourID>& neighbours) const;
/**
* Get state information about this neighbour.
*
* @param nid neighbour information is being request about.
* @param ninfo if neighbour is found its information.
*
*/
bool get_neighbour_info(OspfTypes::NeighbourID nid,
NeighbourInfo& ninfo) const;
/**
* Clear the database.
*/
bool clear_database();
/**
* Add route
*
* @param net network
* @param nexthop
* @param nexthop_id interface ID towards the nexthop
* @param metric to network
* @param equal true if this in another route to the same destination.
* @param discard true if this is a discard route.
* @param policytags policy info to the RIB.
*/
bool add_route(IPNet<A> net, A nexthop, uint32_t nexthop_id,
uint32_t metric, bool equal, bool discard,
const PolicyTags& policytags);
/**
* Replace route
*
* @param net network
* @param nexthop
* @param nexthop_id interface ID towards the nexthop
* @param metric to network
* @param equal true if this in another route to the same destination.
* @param discard true if this is a discard route.
* @param policytags policy info to the RIB.
*/
bool replace_route(IPNet<A> net, A nexthop, uint32_t nexthop_id,
uint32_t metric, bool equal, bool discard,
const PolicyTags& policytags);
/**
* Delete route
*/
bool delete_route(IPNet<A> net);
/**
* Configure a policy filter
*
* @param filter Id of filter to configure.
* @param conf Configuration of filter.
*/
void configure_filter(const uint32_t& filter, const string& conf);
/**
* Reset a policy filter.
*
* @param filter Id of filter to reset.
*/
void reset_filter(const uint32_t& filter);
/**
* Push routes through policy filters for re-filtering.
*/
void push_routes();
/**
* Originate a route.
*
* @param net to announce
* @param nexthop to forward to
* @param metric
* @param policytags policy-tags associated with route.
*
* @return true on success
*/
bool originate_route(const IPNet<A>& net, const A& nexthop,
const uint32_t& metric,
const PolicyTags& policytags);
/**
* Withdraw a route.
*
* @param net to withdraw
*
* @return true on success
*/
bool withdraw_route(const IPNet<A>& net);
/**
* Get the current OSPF version.
*/
OspfTypes::Version get_version() const { return _version; }
/**
* @return a reference to the eventloop, required for timers etc...
*/
EventLoop& get_eventloop() { return _eventloop; }
/**
* The test status of OSPF.
*/
void set_testing(bool testing) {_testing = testing; }
/**
* @return true if OSPF is being tested.
*/
bool get_testing() const { return _testing; }
/**
* @return a reference to the PeerManager.
*/
PeerManager<A>& get_peer_manager() { return _peer_manager; }
/**
* @return a reference to the RoutingTable.
*/
RoutingTable<A>& get_routing_table() { return _routing_table; }
/**
* @return a reference to the LSA decoder.
*/
LsaDecoder& get_lsa_decoder() { return _lsa_decoder; }
/**
* @return a reference to the policy filters
*/
PolicyFilters& get_policy_filters() { return _policy_filters; }
/**
* Get the Instance ID.
*/
uint8_t get_instance_id() const {
XLOG_ASSERT(OspfTypes::V3 == get_version());
return _instance_id;
}
/**
* Set the Instance ID.
*/
void set_instance_id(uint8_t instance_id) {
XLOG_ASSERT(OspfTypes::V3 == get_version());
_instance_id = instance_id;
}
/**
* Get the Router ID.
*/
OspfTypes::RouterID get_router_id() const { return _router_id; }
/**
* Set the Router ID.
*/
void set_router_id(OspfTypes::RouterID id);
/**
* Get RFC 1583 compatibility.
*/
bool get_rfc1583_compatibility() const { return _rfc1583_compatibility;}
/**
* Set RFC 1583 compatibility.
*/
void set_rfc1583_compatibility(bool compatibility) {
// Don't check for equality we can use this as a hack to force
// routing recomputation.
_rfc1583_compatibility = compatibility;
_peer_manager.routing_recompute_all_areas();
}
Trace& trace() { return _trace; }
private:
const OspfTypes::Version _version; // OSPF version.
EventLoop& _eventloop;
bool _testing; // True when testing.
IO<A>* _io; // Indirection for sending and
// receiving packets, as well as
// adding and deleting routes.
string _reason;
ProcessStatus _process_status;
PacketDecoder _packet_decoder; // Packet decoders.
LsaDecoder _lsa_decoder; // LSA decoders.
PeerManager<A> _peer_manager;
RoutingTable<A> _routing_table;
PolicyFilters _policy_filters; // The policy filters.
uint8_t _instance_id; // OSPFv3 Only
OspfTypes::RouterID _router_id; // Router ID.
bool _rfc1583_compatibility; // Preference rules for route
// selection.
map<string, uint32_t> _iidmap; // OSPFv3 only mapping of
// interface/vif to Instance IDs.
Trace _trace; // Trace variables.
};
// The original design did not leave MaxAge LSAs in the database. When
// an LSA reached MaxAge it was removed from the database and existed
// only in retransmission lists. If an LSA was received which seemed
// to be from a previous incarnation of OSPF it had its age set to
// MaxAge and was fired out, also not being added to the database.
// If while a MaxAge LSA is on the retransmission only, either a new
// LSA such as a Network-LSA is generated or an updated LSA arrives a
// second LSA can be created with the same <Type,ID,ADV> tuple. Two LSAs
// can exist on the retransmission list. Leaving the a MaxAge LSA in
// the database solves both problems.
// #define MAX_AGE_IN_DATABASE
#define PARANOIA
#endif // __OSPF_OSPF_HH__
Generated by: pavlin on kobe.xorp.net on Wed Jan 7 19:11:07 2009, using kdoc 2.0a54+XORP.
