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List: cisco-nsp
Subject: Re: [c-nsp] A9K-VSM-500
From: "Aaron Gould" <aaron1 () gvtc ! com>
Date: 2019-05-08 14:08:07
Message-ID: 001001d505a7$769a2af0$63ce80d0$ () gvtc ! com
[Download RAW message or body]
my personal notes from testing vsm-500 from a few years ago...
*** my testing showed good with pings, BUT TERRIBLE and NON-existent web surfing \
until changing MTU of vnics from 1514 to 9216
interface TenGigE0/3/1/0
description vsm
mtu 9216
!
interface TenGigE0/3/1/1
description vsm
mtu 9216
!
interface TenGigE0/3/1/2
description vsm
mtu 9216
!
interface TenGigE0/3/1/3
description vsm
mtu 9216
!
interface TenGigE0/3/1/4
description vsm
mtu 9216
!
interface TenGigE0/3/1/5
description vsm
mtu 9216
!
interface TenGigE0/3/1/6
description vsm
mtu 9216
!
interface TenGigE0/3/1/7
description vsm
mtu 9216
!
interface TenGigE0/3/1/8
description vsm
mtu 9216
!
interface TenGigE0/3/1/9
description vsm
mtu 9216
!
interface TenGigE0/3/1/10
description vsm
mtu 9216
!
interface TenGigE0/3/1/11
description vsm
mtu 9216
----------------------------------------------------------------------------------------------
also i have a document but i can't find it online anywhere... it's titled "ASR9K CGv6 \
on VSM troubleshooting guide"
there is a section subtitled..."3. VSM packet flow troubleshooting"
NOTE 1 : Be aware about CSCuo63064 which explain the packet drops for packet which \
supposed to be fragmented on VSM
Symptom: Packets requiring fragmentation are silently dropped with \
DROP_FRM_FRM_ERR_XAUI9 error count
Conditions: Observed with NAT44 on VSM with packet sizes above 1514 bytes.
Workaround: Increase the interface MTU on the VSM physical interfaces to match the \
ingress interface
More Info: For better NAT44 performance, Cisco recommends keeping the default \
physical interface MTU
This one is targetted to be fixed in 5.2.2 XR release
NOTE 2: Be aware about default MTU for ServiceApp interfaces
in 5.1.3 and 5.2.0: MTU is 1514 (not configurable) in 5.2.2: ServiceApp interface \
will be set by default to Jumbo frame size (not configurable)
CSCuo63064
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCuo63064
-Aaron
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