Got it

MPLS LSP is down between Juniper and NE05

859 0 0 0 0
Issue Description

Topology:

594b7b45e7744cd98126bdc2d75d5e6b


Configuration NE05:

 

#

ip vpn-instance Test1

 description AUXILIARS

 ipv4-family

  route-distinguisher 100:20

  vpn-target 100:20 export-extcommunity

  vpn-target 100:20 import-extcommunity

#

ip vpn-instance Test2

 description RADIOENLLAC

 ipv4-family

  route-distinguisher 100:10

  vpn-target 100:10 export-extcommunity

  vpn-target 100:10 import-extcommunity

#

mpls lsr-id 172.27.0.62

mpls

 mpls te

 mpls rsvp-te

 mpls te cspf

 mpls te cspf preferred-igp ospf 1 area 0.0.0.0

#

mpls ldp

#

#

acl number 2001

 rule 5 permit source 192.168.0.0 0.0.0.255

 rule 6 permit source 10.0.0.0 0.0.0.255

 rule 7 permit source 172.0.0.0 0.0.0.255

#

#

interface GigabitEthernet0/2/10

 description To_Cura

 undo shutdown

 mtu 1548

 ip address 172.27.7.130 255.255.255.252

 ospf cost 100

 ospf network-type p2p

 ospf enable 1 area 0.0.0.0

 mpls

 mpls te

 mpls te bandwidth max-reservable-bandwidth 1000000

 mpls te bandwidth bc0 1000000

 mpls rsvp-te

 mpls ldp

 undo dcn

#

interface NULL0

#

interface LoopBack0

 ip address 172.27.0.62 255.255.255.255

 ospf enable 1 area 0.0.0.0

#

interface Tunnel0/2/10

 description R62toR26

 ip address unnumbered interface LoopBack0

 tunnel-protocol mpls te

 destination 172.27.0.26

 mpls te tunnel-id 1

 mpls te resv-style ff

 mpls te igp shortcut ospf

 mpls te commit

 mpls

 mpls mtu 1548

#

 

 ipv4-family unicast

  undo synchronization

  peer SAMPOL enable

  peer 172.27.0.26 enable

  peer 172.27.0.26 group SAMPOL

 #

 ipv4-family vpnv4

  undo policy vpn-target

  peer SAMPOL enable

  peer SAMPOL reflect-client

  peer 172.27.0.26 enable

  peer 172.27.0.26 group SAMPOL

 #

 ipv4-family vpn-instance Test1

  compare-different-as-med

  import-route direct

 #

 ipv4-family vpn-instance Test2

  compare-different-as-med

  import-route direct

 #

ospf 1 router-id 172.27.0.62

 opaque-capability enable

 enable traffic-adjustment

 advertise mpls-lsr-id

 area 0.0.0.0

  authentication-mode md5 1 cipher XXXXXX

  network 0.0.0.0 255.255.255.255

  mpls-te enable

#

transparent.gif Alarm Information

[HUAWEI]display interface brief

PHY: Physical

*down: administratively down

(l): loopback

(s): spoofing

(b): BFD down

(B): Bit-error-detection down

(e): ETHOAM down

(d): Dampening Suppressed

InUti/OutUti: input utility/output utility

Interface                   PHY   Protocol  InUti OutUti   inErrors  outErrors

Ethernet0/0/0               down  down         0%     0%          0          0

GigabitEthernet0/2/10       up    up           0%     0%          0          0

GigabitEthernet0/2/11       up    up        0.01%     0%          0          0

LoopBack0                   up    up(s)        0%     0%          0          0

NULL0                       up    up(s)        0%     0%          0          0

Tunnel0/2/10                up    down         0%     0%          0          0

Tunnel0/2/11                *down down         0%     0%          0          0


transparent.gif Handling Process

Checked configuration and all looks good on both sides; Took a packet capture and noticed that, since the DD packet in OSPF is more than 1500, the peer device cannot handle it.


transparent.gif Root Cause

Juniper1 cannot handle the ospf dd packet which is over 1500.


transparent.gif Solution

Changed the MTU to 1500 on tunnel interface and physical so that OSPF relation can go to full.

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