[c-nsp] GRE and MSS adjust on ASR9K

[John Neiberger]

A co-worker is replacing a 7600 with an ASR9K running 4.2.3. The 7600
currently terminates a GRE tunnel that requires the tcp mss-adjust
command. Neither one of us can find a similar feature in the XR
command references. Are we just missing it or does this code not have
that feature? It seems like I must just be overlooking it.
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[Blake Dunlap]

Appears to be added in 9k 4.3.2 based on documentation.

http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.3/general/release/notes/reln_432a9k.html#concept_49AEDFA126ED408DBD1B04048C1E24B8

-Blake

Post by John Neiberger
A co-worker is replacing a 7600 with an ASR9K running 4.2.3. The 7600
currently terminates a GRE tunnel that requires the tcp mss-adjust
command. Neither one of us can find a similar feature in the XR
command references. Are we just missing it or does this code not have
that feature? It seems like I must just be overlooking it.
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[John Neiberger]

Thanks! My Google-Fu must be weak. That page didn't turn up for me
despite multiple searches with variations of "IOS XR tcp mss" and
things like that. I appreciate the help.

Post by Blake Dunlap
Appears to be added in 9k 4.3.2 based on documentation.
http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.3/general/release/notes/reln_432a9k.html#concept_49AEDFA126ED408DBD1B04048C1E24B8
-Blake

Post by John Neiberger
A co-worker is replacing a 7600 with an ASR9K running 4.2.3. The 7600
currently terminates a GRE tunnel that requires the tcp mss-adjust
command. Neither one of us can find a similar feature in the XR
command references. Are we just missing it or does this code not have
that feature? It seems like I must just be overlooking it.
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[Sarala Akella (sakella)]

Hello John,



Router using "ip tcp adjust-mss <mtu>



On ASR 9k

RP/0/0/CPU0:router(config)#tcp mss <mtu>

are different commands (tcp mss will only impact the locally

originated TCP sessions, not the sessions flowing through the router)



In case of further questions please open a PDI case

Cisco PDI Help Desk

http://www.cisco.com/go/pdihelpdesk



Best regards,

-Sarala







-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-***@puck.nether.net] On Behalf Of John Neiberger
Sent: Saturday, December 07, 2013 6:26 AM
To: Blake Dunlap
Cc: cisco-***@puck.nether.net
Subject: Re: [c-nsp] GRE and MSS adjust on ASR9K



Thanks! My Google-Fu must be weak. That page didn't turn up for me

despite multiple searches with variations of "IOS XR tcp mss" and

things like that. I appreciate the help.

Post by Blake Dunlap
Appears to be added in 9k 4.3.2 based on documentation.
http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.3/general/release/notes/reln_432a9k.html#concept_49AEDFA126ED408DBD1B04048C1E24B8
-Blake

Post by John Neiberger
A co-worker is replacing a 7600 with an ASR9K running 4.2.3. The 7600
currently terminates a GRE tunnel that requires the tcp mss-adjust
command. Neither one of us can find a similar feature in the XR
command references. Are we just missing it or does this code not have
that feature? It seems like I must just be overlooking it.
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[Alessandro Braga]

John,

please check the impact of applying that command on global configuration mode. I would like to apply that on interface mode.


BR,
Alessandro Braga
CCIE #30939

Post by Sarala Akella (sakella)
Hello John,
Router using "ip tcp adjust-mss <mtu>
On ASR 9k
RP/0/0/CPU0:router(config)#tcp mss <mtu>
are different commands (tcp mss will only impact the locally
originated TCP sessions, not the sessions flowing through the router)
In case of further questions please open a PDI case
Cisco PDI Help Desk
http://www.cisco.com/go/pdihelpdesk
Best regards,
-Sarala
-----Original Message-----
Sent: Saturday, December 07, 2013 6:26 AM
To: Blake Dunlap
Subject: Re: [c-nsp] GRE and MSS adjust on ASR9K
Thanks! My Google-Fu must be weak. That page didn't turn up for me
despite multiple searches with variations of "IOS XR tcp mss" and
things like that. I appreciate the help.

Post by Blake Dunlap
Appears to be added in 9k 4.3.2 based on documentation.
http://www.cisco.com/en/US/docs/routers/asr9000/software/asr9k_r4.3/general/release/notes/reln_432a9k.html#concept_49AEDFA126ED408DBD1B04048C1E24B8
-Blake

Post by John Neiberger
A co-worker is replacing a 7600 with an ASR9K running 4.2.3. The 7600
currently terminates a GRE tunnel that requires the tcp mss-adjust
command. Neither one of us can find a similar feature in the XR
command references. Are we just missing it or does this code not have
that feature? It seems like I must just be overlooking it.
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