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ASR1004 L2VFI Fragemented Paket Drops

Steve
Beginner
Beginner

Hi all,

 

i have a Router Cisco 7301 which is connected via an L2 Tunnel (Xconnect) to an ASR1004(RP2)

via an L2VFI Instance.

MPLS Backbone is build by three Cisco 6504-E with SUP720-10G-3BXL.

The Accessport for the Cisco 7301 is decribed below

 

Everything is up and working fine - but if the clients (SIP PHONES ,which are connected to the 7301)

starts with paket fragmentation (large Invites ....) we have a problem.

Paketfragments where the original has a size between 1501 and 1505 get dropped

(easy to test with ping)

All other pakets are forwarded without any problem

It seem this problem only exist if the Endpoint is a BDI.

If i bind the Endpoint of the Xconnect to a physical Port it works.

 

 

ASR1004(RP2): asr1000rp2-adventerprisek9.03.16.06.S.155-3.S6-ext.bin

6504-E(VS-S720-10G): s72033-adventerprisek9-mz.151-2.SY10.bin

 

*************************

CISCO 6504-E

**************************

!

interface GigabitEthernet3/8
mtu 9180
no ip address
no ip redirects
no ip proxy-arp
no keepalive
no cdp enable
!

interface GigabitEthernet3/8.2300
encapsulation dot1Q 2300
no ip redirects
no ip proxy-arp
no cdp enable
xconnect 172.16.213.254 902030008 encapsulation mpls pw-class TE-via-9341
backup peer 172.16.214.254 802030008 pw-class TE-via-53511
!

**********************

ASR1004

**********************

!
l2 vfi L2VFI_WVNET_902030008 manual
vpn id 902030008
bridge-domain 2300
mtu 9180
neighbor 172.16.212.254 pw-class TE-via-9431
!

interface BDI2300
description ### LAYER3 Termination PE-LINK ###
mtu 9216
bandwidth 400000
ip address xxx.xxx.xxx.xxx
no ip redirects
no ip unreachables
no ip proxy-arp
ip mtu 1600
ip router isis testcore
bfd interval 999 min_rx 999 multiplier 3
clns mtu 1400
isis circuit-type level-2-only
isis metric 500 level-2
isis authentication mode md5
isis authentication key-chain isis-sec-l2
isis bfd

!

!

!

Everything is up and working fine 

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