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FS#748 — FS#4789 — no MTU

Attached to Project— Network
Maintenance
the whole network
CLOSED
100%
On the backbone we used to use "mtu 9216".
with ASR 9010, we also wanted to enable mtu 9216.
Except that ASR takes 14 bytes. What makes the max mtu
on the network with ASR/SRC may be 9202. They did not
thought to put 9230 ...

The problem is that the Nexus 7000, always of Cisco,
enables to put only "mtu 1500" or "mtu 9216". We can
not personalize the mtu as we can do it on the 6k.

Despite this problem, what remains to fix:
Nov 4 17:01:03 rbx-97-n7.fr.eu : 2010 Nov 4 18:00:40 CEST: %ICMPV6-3-ND_LOG: icmpv6 [4240] Inconsistent RA MTU 9216 on Vlan10, ours is: 1500, from fe80::224:c3ff:fe84:400








Date:  Friday, 05 November 2010, 15:35PM
Reason for closing:  Done
Comment by OVH - Thursday, 04 November 2010, 17:51PM

Another solution would be to not connect the N7 with ASR.
Then, to personalize the MTU of 6K to 9202 and then maintain
the MTU 9216 on the N7

test ... it works.

We can also transfer the ASR of the OSPF "mtu-ignore"




Comment by OVH - Thursday, 04 November 2010, 18:27PM

In IPv6 with routers 6K in IOS SXI IPv6 mount the OSPF
by contrast with a SFX, it does not work. We will make further
tests to validate the problem. If it's the case, it's necessary
to upgrade all remaining 6K to SXI.


Comment by OVH - Thursday, 04 November 2010, 18:31PM

IPv4
with MTU 1500 sur 6K/xxx et MTU 1514 on ASR/4.0.0 OSPF mount

IPv6
with MTU 1500 sur 6K/SXF et MTU 1514 on ASR/4.0.0 OSPF mount
with MTU 9202 sur 6K/SXF et MTU 9216 on ASR/4.0.0.OSPF does not mount
with MTU 9202 sur 6K/SXI et MTU 9216 on ASR/4.0.0.OSPF mount

with MTU 1500 sur N7/xxx et MTU 1514 on ASR/4.0.0 OSPF mount
OSPF does not work neither with IPv4 nor with IPv6 with another MTU


Comment by OVH - Friday, 05 November 2010, 15:35PM

We will put only MTU 1500/1514. Damn.