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| author | ckishimo <carles.kishimoto@gmail.com> | 2020-09-28 23:26:18 +0200 |
|---|---|---|
| committer | ckishimo <carles.kishimoto@gmail.com> | 2020-09-29 22:58:49 +0200 |
| commit | ab1464ddb076c874a34c16339a966742e5ea6bad (patch) | |
| tree | 9f22ce365cad23e06972e43fa96048ed15272d52 /tools/git-reindent-branch.py | |
| parent | Merge pull request #7169 from donaldsharp/some_code_cleanup (diff) | |
| download | frr-ab1464ddb076c874a34c16339a966742e5ea6bad.tar.xz frr-ab1464ddb076c874a34c16339a966742e5ea6bad.zip | |
ospfd: flush type 5 when type 7 is removed
When the ASBR stops announcing a prefix into the NSSA area, the LSA
type 7 is removed from the area. However the ABR is refreshing the
type 5 in its LSDB while removing the Type 7 LSA. Routers outside
the area do not get an update.
With the following topology: r1---r2---r3, with r3 being the ASBR
announcing type 7 LSA:
r3 configuration
router ospf
redistribute static
network 10.0.23.0/24 area 1
area 1 nssa
!
We stop announcing prefix 3.3.3.3 in the ASBR
r3# conf
r3(config)# router ospf
r3(config-router)# no redistribute static
r3(config-router)#
r2 (ABR)
r2# sh ip os database
NSSA-external Link States (Area 0.0.0.1 [NSSA])
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 33.33.33.33 3600 0x8000002f 0x13be E2 3.3.3.3/32 [0x0] <-- flushed
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 7 0x8000002f 0x73c7 E2 3.3.3.3/32 [0x0] <-- refreshed(?)
With PR#7086 the LSA type 5 is flushed from the LSDB in r2 and the change is
announced to routers outside the area (r1)
r2# sh ip os da
NSSA-external Link States (Area 0.0.0.1 [NSSA])
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 33.33.33.33 3600 0x80000002 0x6d91 E2 3.3.3.3/32 [0x0] <-- flushed
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 3600 0x80000002 0xcd9a E2 3.3.3.3/32 [0x0] <-- flushed
r1# sh ip os da
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 3600 0x80000002 0xcd9a E2 3.3.3.3/32 [0x0] <-- flushed
Unfortunately I just realized that with PR#7086 I'm introducing a new bug, as Type-5 LSA
are not being refreshed when reaching MaxAge
r2# sh ip os da
NSSA-external Link States (Area 0.0.0.1 [NSSA])
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 33.33.33.33 35 0x80000002 0x6d91 E2 3.3.3.3/32 [0x0] <--- refreshed
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 3600 0x80000002 0xcd9a E2 3.3.3.3/32 [0x0] <--- not refreshed!
So this PR should fix the original issue and the bug introduced later, so when stopping
redistribution in the ASBR, both type 5 and type 7 are flushed:
r2# sh ip os da
NSSA-external Link States (Area 0.0.0.1 [NSSA])
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 33.33.33.33 3600 0x80000002 0x6d91 E2 3.3.3.3/32 [0x0]
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 3600 0x80000002 0xcd9a E2 3.3.3.3/32 [0x0]
Routers outside the area are also notified
r1# sh ip os da
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 3600 0x80000002 0xcd9a E2 3.3.3.3/32 [0x0]
Re-enabling redistribution, both LSA will be advertised again
r3# conf
r3(config)# router ospf
r3(config-router)# no redistribute static
r3(config-router)# redistribute static
r3(config-router)#
r2# sh ip os da
NSSA-external Link States (Area 0.0.0.1 [NSSA])
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 33.33.33.33 19 0x80000001 0x6f90 E2 3.3.3.3/32 [0x0]
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 11 0x80000001 0xcf99 E2 3.3.3.3/32 [0x0]
and they are refreshed when reaching MaxAge
NSSA-external Link States (Area 0.0.0.1 [NSSA])
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 33.33.33.33 10 0x80000002 0x6d91 E2 3.3.3.3/32 [0x0] <-- Seq 2
AS External Link States
Link ID ADV Router Age Seq# CkSum Route
3.3.3.3 10.0.25.2 2 0x80000002 0xcd9a E2 3.3.3.3/32 [0x0] <-- Seq 2
Signed-off-by: ckishimo <carles.kishimoto@gmail.com>
Diffstat (limited to 'tools/git-reindent-branch.py')
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