ASA5506-X Jumbo frames?

[moz]

Hi there!

Does anyone know if ASA5506-X support jumbo (or baby-jumbo) frames? Cisco's literature seems to be rather sparse on the subject with ASA manuals stating something along the lines of "... if you model supports it," without expressly stating what models do actually support it; and am rather apprehensive of spending $$$ for a 5505 upgrade if it doesn't.

Thanks!

[Philip D'Ath]

I haven't tried it, but I just tried entering the commands and it seems to accept.

(config-if)# mtu outside ?
configure mode commands/options:
 <64-9198> MTU bytes

[moz]

An autocomplete hint doesn't mean it works:

ciscoasa(config)# mtu outside ?

configure mode commands/options:
 <64-9198> MTU bytes
ciscoasa(config)# mtu outside 1508

ERROR: Jumbo frames are not supported on this platform.
 MTU size must be <= 1500.

[Marvin Rhoads]

It's supported for all current models - i.e. 5500-X series but not the legacy end-of-sales 5500 (non-X) models. It is not supported on the 5505.

See the note here:

http://www.cisco.com/c/en/us/td/docs/security/asa/asa84/configuration/guide/asa_84_cli_config/interface_start.html#wp1328869

It's recommended that you run ASA 9.1(6) or later.

Reference: 

http://www.cisco.com/c/en/us/td/docs/security/asa/asa-command-reference/I-R/cmdref2/m4.html#pgfId-2124541

[moz]

It's present in software, but that doesn't mean hardware supports it, unfortunately:

Cisco Adaptive Security Appliance Software Version 9.2(4)20 

<snip>

Hardware: ASA5505, 1024 MB RAM, CPU Geode 500 MHz,

<snip>

results in:

ciscoasa(config)# jumbo?
ERROR: % Unrecognized command
ciscoasa(config)# mtu outside 1508

ERROR: Jumbo frames are not supported on this platform.
 MTU size must be <= 1500.

Hence my asking before spending cash to find out that 5506-X doesn't support it either :-)

[Marvin Rhoads]

Updated my earlier reply with clarifying detail...

[moz]

Thanks for the update- that is precisely the droid I was looking for (albeit in the 9.X series documentation).

Unfortunately the list in the link you provided omits 5506-X, with the lowest model being 5512-X.

My guess is that to get jumbo support even on 5512-X, one would still have to buy an ASA-IC-6GE-CU/SFP-X card as the 5500-X Series Datasheet suggests. 

[Marvin Rhoads · Accepted solution]

believe that list was created prior to the release of the 5506, 5508 and 5516-X.

My home 5506-X has the FTD image but I checked and verified that it supports jumbo frames.

I changed the MTU on my Inside interface and it prompted me to reboot.

After reboot I see the MTU size is now at 9198 bytes.

[moz]

That's very helpful, thanks!