mpls20s03l04
TRANSCRIPT
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© 2003, Cisco Systems, Inc. All rights reserved. MPLS v2.0—3-
© 2003, Cisco Systems, Inc. All rights reserved.
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© 2003, Cisco Systems, Inc. All rights reserved. 2
!r"me-Mode#Cell-Mode MPLS Im$lement"tion onCisco I%S Pl"t&orms
'ro()leshooting !r"me-Mode MPLSon Cisco I%S Pl"t&orms
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© 2003, Cisco Systems, Inc. All rights reserved. MPLS v2.0—3-3
%(tline
• %vervie*
• Sym$toms o& Common !r"me-Mode MPLS Iss(es
• L+P Session St"rt($ Iss(es
• L")el Alloc"tion Iss(es
• L")el +istri)(tion Iss(es
• P"cet L")eling Iss(es
• Intermittent MPLS !"il(res A&ter Inter&"ce !"il(re
• P"cet Pro$"g"tion Iss(es
• Lesson S(mm"ry
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© 2003, Cisco Systems, Inc. All rights reserved. MPLS v2.0—3-
Sym$toms o& Common !r"me-ModeMPLS Iss(es
• L+P session does not st"rt.
• L")els "re not "lloc"ted.
• L")els "re not distri)(ted.
• P"cets "re not l")eled "ltho(gh the l")els h"ve)een distri)(ted.
• MPLS intermittently )re"s "&ter "n inter&"ce&"il(re.
• L"rge $"cets "re not $ro$"g"ted "cross thenet*or.
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© 2003, Cisco Systems, Inc. All rights reserved. MPLS v2.0—3-
L+P Session St"rt($ Iss(es
Sym$tom
• L+P neigh)ors "re not discovered.
– sho* m$ls ld$ discovery does not dis$l"y e/$ected L+P neigh)ors
+i"gnosis
• MPLS is not en")led on the "d"cent ro(ter.
1eri&ic"tion• 1eri&y *ith sho* m$ls inter&"ce on the "d"cent ro(ter.
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© 2003, Cisco Systems, Inc. All rights reserved. MPLS v2.0—3-
L+P Session St"rt($ Iss(es Cont.4
Sym$tom
• L+P neigh)ors "re not discovered.
+i"gnosis
• L")el distri)(tion $rotocol mism"tch—'+P on one end,L+P on the other end.
1eri&ic"tion• 1eri&y *ith sho* m$ls inter&"ce det"il on )oth ro(ters.
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L+P Session St"rt($ Iss(es Cont.4
Sym$tom
• L+P neigh)ors "re not discovered.
+i"gnosis
• P"cet &ilter dro$s L+P neigh)or discovery $"cets.
1eri&ic"tion
•
1eri&y "ccess list $resence *ith sho* i$ inter&"ce.• 1eri&y "ccess list contents *ith sho* "ccess-list.
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L+P Session St"rt($ Iss(es Cont.4
Sym$tom
• L+P neigh)ors "re discovered7 L+P session is not est")lished.
– sho* ld$ neigh)or does not dis$l"y " neigh)or in %$er st"te.
+i"gnosis
• Connectivity )et*een loo$)"c inter&"ces is )roen—L+Psession is (s("lly est")lished )et*een loo$)"c inter&"ces o&"d"cent LS8s.
1eri&ic"tion• 1eri&y connectivity *ith e/tended $ing comm"nd.
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L")el Alloc"tion Iss(es
Sym$tom
• L")els "re not "lloc"ted &or loc"l ro(tes.
– sho* m$ls &or*"rding-t")le does not dis$l"y "ny l")els
+i"gnosis
• C:! is not en")led.
1eri&ic"tion• 1eri&y *ith sho* i$ ce& .
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L")el +istri)(tion Iss(es
Sym$tom
• L")els "re "lloc"ted, )(t not distri)(ted.
– sho* m$ls ld$ )indings on "d"cent LS8 does not dis$l"y l")els &rom this LS8.
+i"gnosis
• Pro)lems *ith condition"l l")el distri)(tion.
1eri&ic"tion
• +e)(g l")el distri)(tion *ith de)(g m$ls ld$ "dvertisement.
•
:/"mine the neigh)or L+P ro(ter IP "ddress *ithsho* m$ls ld$ discovery.
• 1eri&y th"t the neigh)or L+P ro(ter IP "ddress is m"tched )y the "ccesslist s$eci&ied in the m$ls "dvertise comm"nd.
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P"cet L")eling Iss(es
Sym$tom
• L")els "re distri)(ted, )(t $"cets "re not l")eled.
–
sho* inter&"ce st"tistic does not sho* l")eled $"cets )eing sent
+i"gnosis
• C:! is not en")led on in$(t inter&"ce $otenti"lly d(e tocon&licting &e"t(re )eing con&ig(red4.
1eri&ic"tion• 1eri&y *ith sho* ce& inter&"ce.
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P"cet L")eling Iss(es Cont.4sho* ce& inter&"ce
Router#show cef interfaceSerial1/0.1 is up (if_number 15) Internet address is 1!.1".$.5/$0 I%&' redirects are alwas sent 'er pacet loadbalancin* is disabled I' unicast R'+ chec is disabled Inbound access list is not set ,utbound access list is not set I' polic routin* is disabled Interface is mared as point to point interface -ardware idb is Serial1/0 +ast switchin* tpe 5 interface tpe " I' %+ switchin* enabled I' %+ '2 +ast switchin* turbo 3ector Input fast fla*s 041000 ,utput fast fla*s 040 ifinde4 $($) Slot 1 Slot unit 0 % 1 6ransmit limit accumulator 040 (040) I' &67 1500
Router#show cef interfaceSerial1/0.1 is up (if_number 15) Internet address is 1!.1".$.5/$0 I%&' redirects are alwas sent 'er pacet loadbalancin* is disabled I' unicast R'+ chec is disabled
Inbound access list is not set ,utbound access list is not set I' polic routin* is disabled Interface is mared as point to point interface -ardware idb is Serial1/0 +ast switchin* tpe 5 interface tpe " I' %+ switchin* enabled
I' %+ '2 +ast switchin* turbo 3ector Input fast fla*s 041000 ,utput fast fla*s 040 ifinde4 $($) Slot 1 Slot unit 0 % 1 6ransmit limit accumulator 040 (040) I' &67 1500
Router#show cef interface
I' %+ switchin* enabled
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Intermittent MPLS !"il(res A&terInter&"ce !"il(re
Sym$tom
• %ver"ll MPLS connectivity in " ro(ter intermittently
)re"s "&ter "n inter&"ce &"il(re.+i"gnosis
• IP "ddress o& " $hysic"l inter&"ce is (sed &or L+P or '+P4identi&ier. Con&ig(re " loo$)"c inter&"ce on the ro(ter.
1eri&ic"tion• 1eri&y loc"l L+P identi&ier *ith sho* m$ls ld$ neigh)ors.
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P"cet Pro$"g"tion Iss(es
Sym$tom
• L"rge $"cets "re not $ro$"g"ted "cross the net*or.
– e/tended $ing *ith v"rying $"cet si;es &"ils &or $"cet si;es close to 00
• In some c"ses, MPLS might *or, )(t MPLS 1P< *ill &"il.
+i"gnosis
• L")el M'= iss(es or s*itches th"t do not s($$ort (m)o &r"mes in the&or*"rding $"th.
1eri&ic"tion
• Iss(e the tr"cero(te comm"nd thr( the &or*"rding $"th7 identi&y "ll LA<
segments in the $"th.• 1eri&y l")el M'= setting on ro(ters "tt"ched to LA< segments.
• Chec &or lo*-end s*itches in the tr"nsit $"th.
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S(mm"ry
• Sever"l common iss(es th"t "rise in MPLS net*ors
• I& no neigh)ors "re discovered ens(re MPLS is en")led onthe neigh)or "nd ens(re th"t l")el distri)(tion $rotocol isthe s"me )et*een "d"cent ro(ters
• C:! needs to )e en")led &or MPLS to &(nction $ro$erly
• I& (sing condition"l l")el "dvertisement ens(re "ccess-listsh"ve correct IP "ddresses
• :ns(re there "re no con&licts )et*een C:! "nd "ny other
con&ig(red &e"t(res > co(ld c"(se $"cets not to)e l")eled
• =se loo$)"c IP "ddresses "nd not " con&ig(red inter&"ce IP"ddress
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