Hi Gert,
There are counters suggesting that IPv4 frames are punted to LC CPU to be
fragmented.
sh controllers np descriptions location 0/x/cpu0
RSV_PUNT_IP_MTU_EXCEEDED L3 Egress IP
packets that exceed the interface MTU. IPv4 frames are punted to LC CPU to be
fragmented. IPv6 frames are punted to LC CPU be dropped and generate ICMP
response.Punt rate limit is very low to protect LC CPU
IPV4_FRAG_NEEDED_PUNT Punt IP MTU
Exceeded. Punted to CPU for fragmentation
MPLS_FRAG_NEEDED_PUNT Punt MPLS packet
for which fragmentation is required
IPV4_FRAG_TUNNEL Punt Not
implemented by ucode
-this one actually concerns me
-does it mean it's going to be slow, or punted to RP, or just dropped
-not sure what I should make up from this
adam
>
Adam Vitkovsky
IP Engineer
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-----Original Message-----
> From: cisco-nsp [mailto:[email protected]] On Behalf Of
> Gert Doering
> Sent: 11 August 2015 09:53
> To: [email protected]
> Subject: [c-nsp] GRE fragmentation and ASR9001
>
> Hi,
>
> my google fu is failing me - so apologies if this is in easily findable
> documentation...
>
> I want (need) to connect two ASR9001s over a GRE tunnel "across the
> public Internet" (= outside MTU 1500), but need to provide a larger inner
> MTU (~1600). So, fragmentation and reassembly required.
>
> Easy question: can the ASR9001 do that (in hardware, obviously)?
>
> Pointers to documentation appreciated :-)
>
> (Current XR release is 4.3.4, but knowing that "it is supported starting
> in 5.17.4" would also be useful information)
>
> gert
> --
> USENET is *not* the non-clickable part of WWW!
> //www.muc.de/~gert/
> Gert Doering - Munich, Germany [email protected]
> fax: +49-89-35655025 [email protected]
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