ChangeLog.opaque.txt
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- Changes 2002.12.20
- 1. Bug fixes
- 1.1 When an opaque LSA is being removed from (or added to) the LSDB,
- it does not mean a change in network topology. Therefore, SPF
- recalculation should not be triggered in that case.
- There was an assertion failure problem "assert (rn && rn->info)"
- inside the function "ospf_ase_incremental_update()", because
- the upper function "ospf_lsa_maxage_walker_remover()" called it
- when a type-11 opaque LSA is removed due to MaxAge.
- 1.2 Type-9 LSA is defined to have "link-local" flooding scope.
- In the Database exchange procedure with a new neighbor, a type-9
- LSA was added in the database summary of a DD message, even if
- the link is different from the one that have bound to.
- 2. Feature enhancements
- 2.1 Though a "wildcard" concept to handle type-9/10/11 LSAs altogether
- has introduced about a year ago, it was only a symbol definition
- and actual handling mechanism was not implemented. Now it works.
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- Changes 2002.7.8
- 1. Bug fixes
- 1.1 When "ospf_delete_opaque_functab()" is called, internal structure
- "oipt" remain unfreed. If register/delete functab is repeated,
- illegal memory access happens due to this "oipt".
- 1.2 In "free_opaque_info_per_id()", there was a crucial typo which
- ignores a condition test.
- "if (oipi->lsa != NULL);" <-- semicolon!
- 2. Feature enhancements
- None.
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- Changes 2001.12.03
- 1. Bug fixes
- 1.1 Though a new member "oi" has added to "struct ospf_lsa" to control
- flooding scope of type-9 Opaque-LSAs, the value was always NULL
- because no one set it.
- 1.2 In the function "show_ip_ospf_database_summary()" and "show_lsa_
- detail_adv_router()", VTY output for type-11 Opaque-LSAs did not
- work properly.
- 1.3 URL for the opaque-type assignment reference has changed.
- 1.4 In the file "ospf_mpls_te.c", printf formats have changed to
- avoid compiler warning messages; "%lu" -> "%u", "%lx" -> "%x".
- Note that this hack depends on OS, compiler and their versions.
- 1.5 One of attached documentation "opaque_lsa.txt" has changed to
- reflect the latest coding.
- 2. Feature enhancements
- 2.1 Knowing that it is an ugly hack, an "officially unallocated"
- opaque-type value 0 has newly introduced as a "wildcard",
- which matches to all opaque-type.
- This value must not be flooded to the network, of course.
- 2.2 The Opaque-core module makes use of newly introduced hooks to
- dispatch every LSDB change (LSA installation and deletion) to
- preregistered opaque users.
- Therefore, by providing appropriate callback functions as new
- parameters of "ospf_register_opaque_functab()", an opaque user
- can refer to every LSA instance to be installed into, or to be
- deleted from, the LSDB.
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- Changes 2001.10.31
- 1. Bug fixes
- 1.1 Since each LSA has their own lifetime, they will remain in a
- routing domain (being stored in LSDB of each router), until their
- age naturally reach to MaxAge or explicitly being flushed by the
- originated router. Therefore, if a router restarted with a short
- downtime, it is possible that previously flooded self-originated
- LSAs might received if the NSM status is not less than Exchange.
- There were some problems in the way of handling self-originated
- Opaque-LSAs if they are contained in a received LSUpd message,
- but not installed to the local LSDB yet.
- Regardless of some conditions to start originating Opaque-LSAs
- (there should be at least one opaque-capable full-state neighbor),
- the function "ospf_flood()" will be called to flood and install
- this brand-new looking LSA.
- As the result, when the NSM of an opaque-capable neighbor gets
- full, internal state inconsistency happens; a user of Opaque-LSA
- such as MPLS-TE can refer to self-originated LSAs in the local
- LSDB, but cannot modify their contents...
- Above problems have fixed with a policy "flush it from the whole
- routing domain and keep silent until the flushing completed".
- By using this sweeping technique, we can be free from confusion
- caused by self-originated LSAs received via network.
- 1.2 The function "ospf_opaque_type_name()" contained massive ifdefs
- corresponding to each "opaque-type".
- These unnecessary ifdefs are removed completely.
- 1.3 In the function "ospf_delete_opaque_functab()", there was an
- improper loop control that causes illegal memory access.
- Original coding was "next = nextnode (node)".
- 1.4 The function "ospf_mpls_te_ism_change()" could not handle the
- case when the ISM changes from Waiting to DR/BDR/Other.
- So, there was a case that even if one of an ISM become
- operational and MPLS-TE module has started, the corresponding
- Opaque-LSA cannot be originated.
- 1.5 The function "ospf_opaque_lsa_reoriginate_schedule()" did not
- allow to be called multiple times, simply because handling
- module for the given "lsa-type & opaque-type" already exists.
- But this assumption seems to be wrong.
- Change the policy to allow this function to be called multiple
- times and let the caller to decide what should do when the
- corresponding callback function "(* functab->lsa_originator)()"
- is called.
- 2. Feature enhancements
- 2.1 The global bitmap "opaque" has introduced instead of former flag
- "OpaqueCapable", to store complex conditions to handle Opaque-LSAs.
- 2.2 The MPLS-TE module now referes to "draft-katz-yeung-ospf-traffic
- -06.txt", no significant changes with 05 version, though.
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- Changes 2001.08.03
- 1. Bug fixes
- 1.1 Even if the ospfd started with opaque capability enabled, when
- the ospfd receives an unknown opaque-type (unregistered by the
- function "ospf_register_opaque_functab()" beforehand), the LSA
- was discarded. As the result, only the opaque-LSAs that have
- commonly registered by opaque-capable ospf routers can be
- flooded in a routing domain.
- This behavior has fixed so that arbitrary opaque-type LSAs can
- be flooded among opaque-capable ospf routers.
- If the ospfd has opaque-LSA capability but disabled at runtime,
- received opaque-LSAs can be accepted and registered to LSDB as
- is, but not be flooded to the network; those opaque LSAs will
- remain in LSDB until explicitly flushed by incoming LSUpd
- messages with MaxAge, or their age naturally reaches to MaxAge.
- 1.2 The function "ospf_register_opaque_functab()" did not check
- if the entry corresponding to the given "lsa-type, opaque-type"
- combination already exists or not.
- This problem has fixed not to allow multiple registration.
- 1.3 Since type-11 (AS external) LSAs will be flooded beyond areas,
- there is little relationship between "struct lsa" and "struct
- area". More specifically, the pointer address "lsa->area" can
- be NULL if the lsa-type is 11, thus an illegal memory access
- will happen. This problem has fixed.
- 1.4 When self-originated opaque-LSAs are received via network and
- if the corresponding opaque-type functions are not available
- (they have already deleted) at that time, those LSAs were
- dropped due to "unknown opaque-type" error.
- After the problem 1.1 has fixed, those "self-originated" LSAs
- were registered to LSDB and then flooded to the network, even
- if the processing functions did not exist...
- After all, this problem has fixed so that those LSAs should
- explicitly be flushed from the routing domain immediately, if
- the processing functions cannot find at that time.
- 1.5 Some typo have fixed.
- --- EXAMPLE ---
- static int
- opaque_lsa_originate_callback (list funclist, void *lsa_type_dependent)
- ^^^^^
- --- EXAMPLE ---
- 2. Feature enhancements
- 2.1 According to the description of rfc2328 in section 10.8, any
- change in the router's optional capabilities should trigger
- the option re-negotiation procedures with neighbors.
- --- EXCERPT ---
- If for some reason the router's optional
- capabilities change, the Database Exchange procedure should be
- restarted by reverting to neighbor state ExStart.
- --- EXCERPT ---
- For the opaque-capability changes, this feature has implemented.
- More specifically, if "ospf opaque-lsa" or "no ospf opaque-lsa"
- VTY command is given at runtime, all self-originated LSAs will
- be flushed immediately and then all neighbor status will be
- forced to ExStart by generating SeqNumberMismatch events.
- 2.1 When we change opaque-capability dynamically (ON -> OFF -> ON),
- there was no trigger at "OFF->ON" timing to reactivate opaque
- LSA handling modules (such as MPLS-TE) that have once forcibly
- stopped at "ON->OFF" timing.
- Now this dynamic reactivation feature has added.
- 2.2 The MPLS-TE module now referes to "draft-katz-yeung-ospf-traffic
- -05.txt", no significant changes with 04 version, though.
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- Changes 2001.03.28
- Initial release of Opaque-LSA/MPLS-TE extensions for the zebra/ospfd.