With MPLS - No Fragmantation with MTU Size 1501-1504

Ping with MTU 1500 and 1505 is OK.
Ping with MTU 1501-1504 doesn?t work - there is no fragmantation done.
This occures on a Cisco7200 and Cisco7500 where traffic is sended via a labeld switch path: MTU-Size from the Fast/Gig Eth-Interface is set to 1500. With no MPLS "no mpls ip" everthing works fine.
Does anyone have a solution for this?
Thanks and Regards
Erich

Hello,
did you configure "mpls mtu 1512" on all MPLS enabled interfaces? F.e.:
interface FastEthernet0/0/0
mpls mtu 1512
This would allow for as much as 3 labels.
There is no fragmentation for labeled packets, only for IP. So this could be a software/hardware bug as well.
Hope this helps! Please rate all posts.
Regards, Martin

Similar Messages

IPv4 Backbone Baby Jumbo MTU size - any adverse effect?

Hello.
Is there any complication or adverse effect, setting IPv4/MPLS backbone GE link MTU size bigger than the Ethernet De facto of 1500, in the ASR9000 IOX-XR 4.3.x? What would be practical size? 4470, 8192? We have customers request to set 1800 but too odd value. What is the value the ASR9K (Trident LC with RSP, not 440) and LCs supports?
Much appreciate for your support.
Thanks,
Intopian.

That is correct Won, there are other advantages also as you noted.
For routing protocols:
OSPF uses it to fill its DBD's do both sides need to ahve the same MTU size,
same applies to ISIS.
RIP doesnt really care, although it can pack more updates in a single packet
BGP, using TCP, will use the MTU to adjust its MSS value so BGP benefits from this also big time.
As for delay on voip, yes theoretically, if the link speed is low enough, serialization delay of a large mtu packet may induce jitter on the high priority voip packet. But with 1500 bytes, the "fragment" size should be adjusted at 750k (so half T1 speed) only. With the majority circuits operating now at 1G, 10G etc, this fragment size requirement is almost no longer there as the serialization delay is so low at these speeds.
Other then very low end CPE's or very old devices that dont like larger MTU's (eg very old PA's in the 7200) there is really no worry anymore increasing the MTU size.
I dont think there is a formal doc on this, but I am sure if google it, you can find recommendations from other folks
on what they have done/seen etc.
regards
xander
Xander Thuijs CCIE #6775
Principal Engineer
ASR9000, CRS, NCS6000 & IOS-XR

MTU Size Problem Loading Certain Webpages

Hello Colleagues,
I'm having a strange problem dealing with MTU sizes and loading certain webpages. I am aware of the default Microsoft MTU of 1500 and also using GRE IPSEC Tunnels recommended at MTU size 1400. I have since manually set some users PC's to MTU of 1400 and most of those users are experiencing no issues. However, there are a few users who still experience website loading issues even though I have manually changed their MTU size to 1400.
These are domain accounts will the same image loads on their machines, so all have the same permissions, rights, firewall settings, etc. They all use the same LAN, switches, and routers.
Here are the router configs, router 1 and router 2
Router 1
Current configuration : 9006 bytes
version 15.3
no service pad
service timestamps debug datetime msec localtime
service timestamps log datetime msec localtime
service password-encryption
hostname R-US-RS-WVPN1
boot-start-marker
boot system flash:c1900-universalk9-mz.SPA.153-1.T1.bin
boot system flash:c1900-universalk9-mz.SPA.151-3.T1.bin
boot-end-marker
logging buffered 64000
enable secret 5 *removed*
no aaa new-model
clock timezone CET 1 0
clock summer-time CET recurring last Sun Mar 2:00 last Sun Oct 3:00
errdisable recovery cause udld
errdisable recovery cause bpduguard
errdisable recovery cause rootguard
errdisable recovery cause pagp-flap
errdisable recovery cause dtp-flap
errdisable recovery cause link-flap
errdisable recovery interval 303
ip cef
ip domain name corp.com
ip name-server 10.###.8.21
ip name-server 10.###.8.96
ip inspect dns-timeout 90
ip inspect tcp idle-time 60
ip inspect name fw smtp timeout 120
ip inspect name fw ftp timeout 120
ip inspect name fw realaudio
ip inspect name fw tftp timeout 30
ip inspect name fw udp timeout 30
ip inspect name fw tcp timeout 60
no ipv6 cef
multilink bundle-name authenticated
crypto pki trustpoint TP-self-signed-316595902
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-316595902
revocation-check none
rsakeypair TP-self-signed-316595902
crypto pki certificate chain TP-self-signed-316595902
certificate self-signed 01
*removed*
        quit
license udi pid CISCO1921/K9 sn FTX153182M8
spanning-tree vlan 229 priority 8192
redundancy
ip ssh version 2
crypto isakmp policy 10
hash md5
authentication pre-share
lifetime 3600
crypto isakmp key *removed* address 70.###.172.142
crypto isakmp key *removed* address 184.###.###.254
crypto isakmp keepalive 35 11
crypto ipsec transform-set FY-WVPN-Tunnel esp-aes esp-md5-hmac
mode tunnel
crypto map vpn 10 ipsec-isakmp
set peer 70.###.172.142
set peer 184.###.###.254
set transform-set FY-WVPN-Tunnel
match address gre-tunnel-list
interface Loopback0
ip address 10.###.0.10 255.255.255.255
interface Tunnel2291
description Primary-TimewarnerTelecom-Ral-FayWVPN1
ip address 10.###.99.26 255.255.255.252
no ip redirects
cdp enable
tunnel source 66.###.161.126
tunnel destination 184.###.###.254
crypto map vpn
interface Tunnel2293
description Primary-TimewarnerTelecom-Ral-FayWVPN2
ip address 10.###.99.154 255.255.255.252
no ip redirects
cdp enable
tunnel source 66.###.161.126
tunnel destination 70.###.172.142
crypto map vpn
interface Embedded-Service-Engine0/0
no ip address
shutdown
interface GigabitEthernet0/0
description TW Telecom/DMVPN1
ip address 66.###.161.126 255.255.255.252
ip access-group Block-Internet in
ip access-group Block-Internet out
duplex auto
speed auto
no cdp enable
crypto map vpn
interface GigabitEthernet0/1
no ip address
duplex auto
speed auto
interface GigabitEthernet0/0/0
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/1
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/2
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/3
description PBX Eth1
switchport access vlan 229
no ip address
interface Vlan1
no ip address
shutdown
interface Vlan229
ip address 10.###.229.253 255.255.255.0
ip helper-address 10.###.231.201
standby 229 ip 10.###.229.254
standby 229 priority 105
standby 229 preempt
router eigrp 100
network 10.0.0.0
ip forward-protocol nd
no ip http server
ip http secure-server
ip route 70.###.172.142 255.255.255.255 66.###.161.125
ip route 184.###.###.254 255.255.255.255 66.###.161.125
ip route 205.###.96.180 255.255.255.252 66.###.161.125
ip access-list extended Block-Internet
permit esp host 66.###.161.126 host 184.###.###.254
permit esp host 184.###.###.254 host 66.###.161.126
permit udp host 66.###.161.126 host 184.###.###.254 eq isakmp
permit udp host 184.###.###.254 host 66.###.161.126 eq isakmp
permit esp host 66.###.161.126 host 70.###.172.142
permit esp host 70.###.172.142 host 66.###.161.126
permit udp host 66.###.161.126 host 70.###.172.142 eq isakmp
permit udp host 70.###.172.142 host 66.###.161.126 eq isakmp
permit icmp host 66.###.161.126 host 184.###.###.254
permit icmp host 184.###.###.254 host 66.###.161.126
permit icmp host 66.###.161.126 host 70.###.172.142
permit icmp host 70.###.172.142 host 66.###.161.126
permit icmp any any echo-reply
permit icmp any any time-exceeded
permit icmp any any packet-too-big
permit icmp any any traceroute
permit icmp any any unreachable
deny   ip any any
deny   icmp any any
ip access-list extended gre-tunnel-list
permit gre host 66.###.161.126 host 184.###.###.254
permit gre host 66.###.161.126 host 70.###.172.142
logging host 10.100.###.254
logging host 10.100.###.246
snmp-server community a RW 20
snmp-server community r RO 20
snmp-server community a RW 20
snmp-server community r RO 20
snmp-server community P_RW RW
snmp-server community P_RO RO
snmp-server enable traps entity-sensor threshold
snmp-server host 10.100.###.246 public
snmp-server host 10.100.###.254 public
access-list 20 permit 10.###.9.3
access-list 20 permit 10.###.8.16
access-list 20 permit 10.100.###.249
access-list 20 permit 10.100.###.254
access-list 20 permit 10.100.###.246
control-plane
banner motd ^CCCCCCC
****************** Warning! Warning! Warning! ********************
This system is restricted to authorized users for business
purposes. Unauthorized access is a violation of the law. This
service may be monitored for administrative and security reasons.
By proceeding, you consent to this monitoring
****************** Warning! Warning! Warning! ********************
^C
line con 0
login local
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
exec-timeout 60 0
password 7 *removed*
login local
transport input ssh
line vty 5 15
exec-timeout 60 0
password 7 *removed*
login local
transport input ssh
scheduler allocate 20000 1000
ntp server 10.###.8.8 prefer
ntp server 10.###.231.200 prefer
ntp server 10.###.8.69
ntp server 10.###.1.6 prefer
end
Router 2
Current configuration : 9013 bytes
version 15.3
no service pad
service timestamps debug datetime msec localtime
service timestamps log datetime msec localtime
service password-encryption
hostname R-US-RS-WVPN2
boot-start-marker
boot system flash:c1900-universalk9-mz.SPA.153-1.T1.bin
boot system flash:c1900-universalk9-mz.SPA.151-3.T1.bin
boot-end-marker
logging buffered 64000
logging console critical
enable secret 5 *removed*
no aaa new-model
clock timezone CET 1 0
clock summer-time CET recurring last Sun Mar 2:00 last Sun Oct 3:00
errdisable recovery cause udld
errdisable recovery cause bpduguard
errdisable recovery cause rootguard
errdisable recovery cause pagp-flap
errdisable recovery cause dtp-flap
errdisable recovery cause link-flap
errdisable recovery interval 303
ip cef
ip domain name corp.mann-hummel.com
ip name-server 10.###.8.21
ip name-server 10.###.8.96
ip inspect dns-timeout 90
ip inspect tcp idle-time 60
ip inspect name fw smtp timeout 120
ip inspect name fw ftp timeout 120
ip inspect name fw realaudio
ip inspect name fw tftp timeout 30
ip inspect name fw udp timeout 30
ip inspect name fw tcp timeout 60
ipv6 multicast rpf use-bgp
no ipv6 cef
multilink bundle-name authenticated
crypto pki trustpoint TP-self-signed-3179596086
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-3179596086
revocation-check none
rsakeypair TP-self-signed-3179596086
crypto pki certificate chain TP-self-signed-3179596086
certificate self-signed 01
*removed*
        quit
license udi pid CISCO1921/K9 sn FTX153182M2
spanning-tree vlan 229 priority 1###84
redundancy
ip ssh version 2
crypto isakmp policy 10
hash md5
authentication pre-share
lifetime 3600
crypto isakmp key *removed* address 70.###.172.142
crypto isakmp key *removed* address 184.###.###.254
crypto isakmp keepalive 35 11
crypto ipsec transform-set Fay-Ral-WVPN-Tunnel esp-aes esp-md5-hmac
mode tunnel
crypto map vpn 10 ipsec-isakmp
set peer 184.###.###.254
set peer 70.###.172.142
set transform-set Fay-Ral-WVPN-Tunnel
match address gre-tunnel-list
interface Loopback0
ip address 10.###.0.12 255.255.255.255
interface Tunnel2292
description Failover-TimewarnerCable-Ral-Fay-WVPN2
ip address 10.###.99.30 255.255.255.252
no ip redirects
cdp enable
tunnel source 96.###.25.226
tunnel destination 184.###.###.254
crypto map vpn
interface Tunnel2294
description Failover-TimewarnerCable-Ral-Fay-WVPN2
ip address 10.###.99.158 255.255.255.252
no ip redirects
cdp enable
tunnel source 96.###.25.226
tunnel destination 70.###.172.142
crypto map vpn
interface Embedded-Service-Engine0/0
no ip address
shutdown
interface GigabitEthernet0/0
description Fay-Ral WVPN
ip address 96.###.25.226 255.255.255.252
ip access-group Block-Internet in
ip access-group Block-Internet out
duplex auto
speed auto
no cdp enable
crypto map vpn
interface GigabitEthernet0/1
no ip address
shutdown
duplex auto
speed auto
interface GigabitEthernet0/0/0
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/1
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/2
switchport access vlan 229
no ip address
interface GigabitEthernet0/0/3
description PBX Eth2
switchport access vlan 229
no ip address
interface Vlan1
no ip address
shutdown
interface Vlan229
ip address 10.###.229.252 255.255.255.0
ip helper-address 10.###.231.201
standby 229 ip 10.###.229.254
standby 229 preempt
router eigrp 100
network 10.0.0.0
ip forward-protocol nd
no ip http server
ip http secure-server
ip route 70.###.172.142 255.255.255.255 96.###.25.225
ip route 184.###.###.254 255.255.255.255 96.###.25.225
ip route 205.###.96.180 255.255.255.252 66.###.161.125
ip access-list extended Block-Internet
permit esp host 96.###.25.226 host 184.###.###.254
permit esp host 184.###.###.254 host 96.###.25.226
permit udp host 96.###.25.226 host 184.###.###.254 eq isakmp
permit udp host 184.###.###.254 host 96.###.25.226 eq isakmp
permit esp host 96.###.25.226 host 70.###.172.142
permit esp host 70.###.172.142 host 96.###.25.226
permit udp host 96.###.25.226 host 70.###.172.142 eq isakmp
permit udp host 70.###.172.142 host 96.###.25.226 eq isakmp
permit icmp host 96.###.25.226 host 184.###.###.254
permit icmp host 184.###.###.254 host 96.###.25.226
permit icmp host 96.###.25.226 host 70.###.172.142
permit icmp host 70.###.172.142 host 96.###.25.226
permit icmp any any echo-reply
permit icmp any any time-exceeded
permit icmp any any packet-too-big
permit icmp any any traceroute
permit icmp any any unreachable
deny   ip any any
deny   icmp any any
ip access-list extended gre-tunnel-list
permit gre host 96.###.25.226 host 184.###.###.254
permit gre host 96.###.25.226 host 70.###.172.142
logging host 10.100.###.254
logging host 10.100.###.246
snmp-server community P_RW RW
snmp-server community P_RO RO
snmp-server community a RW 20
snmp-server community r RO 20
snmp-server community a RW 20
snmp-server community r RO 20
snmp-server enable traps entity-sensor threshold
snmp-server host 10.100.###.246 public
snmp-server host 10.100.###.254 public
access-list 20 permit 10.###.9.3
access-list 20 permit 10.###.8.16
access-list 20 permit 10.100.###.249
access-list 20 permit 10.100.###.254
access-list 20 permit 10.100.###.246
control-plane
banner motd ^CCCCCC
****************** Warning! Warning! Warning! ********************
This system is restricted to authorized users for business
purposes. Unauthorized access is a violation of the law. This
service may be monitored for administrative and security reasons.
By proceeding, you consent to this monitoring
****************** Warning! Warning! Warning! ********************
^C
line con 0
login local
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport input all
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
exec-timeout 60 0
password 7 *removed*
login local
transport input ssh
line vty 5 15
exec-timeout 60 0
password 7 *removed*
login local
transport input ssh
scheduler allocate 20000 1000
ntp server 10.###.8.8 prefer
ntp server 10.###.231.200 prefer
ntp server 10.###.8.69
ntp server 10.###.1.6 prefer
end

UPDATE
I have since applied the following config to the tunnel interfaces:
ip mtu 1400
ip tcp adjust-mss 1400
tunnel path-mtu-discovery
This worked and I was able to reset each users PC to default MTU size of 1500, but only until just now. I got a call from a user who explained that he wasn't able to reach some websites, again.
Sure enough, I've just confirmed that all of the users are unable to access the websites any longer.
This is crazy, does anyone have any ideas?

EIGRP MTU Size Causing Neighbor Flap - Pls help!

I've been reading the post here which is quite good but, I have some outstanding questions I hope someone can help me with?
https://learningnetwork.cisco.com/thread/43100#233367
Essentially, we have a DCI which is an evpl link - layer 2. The evpl connection is terminated with a Cisco 3925 at each location (once it comes out of the provider's Ciena box). It is a dot1g tagged trunk - L2 connection. We are running EIGRP between the two. Before setting up OTV, all link sizes were 1500 MTU...which obviously will not work with OTV....and it didnt!. OTV is running on 7Ks a few hops away from each 3925. So, I went on each and every link - (pain stakingly) and configured MTU size for 9216 - enabling jumboframes at the system level too where applicable. What do you know, OTV started working and i could ping to at least up to 2000 bytes with DF-bit set too! (I didn't try any higher).
Last night, our provider did some 'maintenance' without telling us - which brought the link down. The link was 'down' even after the maintenace was completed. After looking in the logs and seeing this, I suspected it had to do with MTU sizes after quickly googling around.
May 13 12:33:13.698: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is down: Interface PEER-TERMINATION received
May 13 12:33:13.976: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is up: new adjacency
May 13 12:33:24.266: %SYS-5-CONFIG_I: Configured from console by izzi on vty0 (10.241.6.12)
May 13 12:34:00.286: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is down: Interface PEER-TERMINATION received
May 13 12:34:00.616: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is up: new adjacency
May 13 12:34:46.922: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is down: Interface PEER-TERMINATION received
May 13 12:34:47.280: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is up: new adjacency
May 13 12:35:37.364: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is down: holding time expired
May 13 12:37:29.725: %SYS-5-CONFIG_I: Configured from console by izzi on vty0 (10.241.6.12)
May 13 12:37:47.430: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is up: new adjacency
May 13 12:39:01.508: %SYS-5-CONFIG_I: Configured from console by izzi on vty0 (10.241.6.12)
May 13 12:39:11.943: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is down: Interface PEER-TERMINATION received
May 13 12:39:13.973: %DUAL-5-NBRCHANGE: EIGRP-IPv4 10: Neighbor 198.28.132.30 (GigabitEthernet0/0.2) is up: new adjacency
So, I reduced the MTU size back to 1500 and low and behold, adjacency stayed. Let me also say that there weren't any errors on the links too. So, I decided to try and increase the MTU back up to 9216 - OTV started working again and adjancey held - it didnt flap. I thought for a second and decided to bounce the link. Once i did this, EIGRP started flapping again with the same exact behavior. After calling the provider, they claim that their max MTU is only 1522 for our EVPL link. I don't see this being possible since I was able to ping DF-BIT set way above 1522. Maybe I'm missing something. We are going to coordinate with them to increase the MTU size on the link. But why/how did it work to begin with - especially since OTV doesn't support fragmenation....I understand that OTV adjacency can still form since ISIS only needs 14xx something...but I wasn't able to get certain protocals/services like esxi host management to work via OTV until i increased MTU size.
Also, after reading the above article it sounds like EIGRP will 'peer' or decide on MTU of it's update packets? If that's the case, maybe the bouncing of the link allowed EIGRP to negotiate it's packet sizes to above 1500 and that's why if I change the MTU size to above 1500 everything works fine - OTV/2000 byte bf-bit set ping, until I bounce the link? If this is the case, is there anyway to 'force' EIGRP to use 1500 for it's packets for its protocol traffic and allow everything else to use the MTU set on the link?
I would appreciate any help explaining this - hopefully you're not as confused as I was after reading it again!

Did you ever find the root cause and this solution for this? We are experiencing the same issues with our 2 4500 Catalyst and a couple of routers on our inter routing VLAN that we use for only the 2 chassis and a couple of router. MTU is already set at 1500 on the 2 chassis.
005326: Jan 19 11:30:02: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.21 (Vlan990) is down: Peer goodbye received
005327: Jan 19 11:30:05: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.1 (Vlan990) is up: new adjacency
005328: Jan 19 11:30:05: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.21 (Vlan990) is up: new adjacency
005329: Jan 19 11:30:07: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.12 (Vlan990) is down: holding time expired
005330: Jan 19 11:30:27: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.21 (Vlan990) is down: Peer goodbye received
005331: Jan 19 11:30:28: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.11 (Vlan990) is down: Peer goodbye received
005332: Jan 19 11:30:28: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.1 (Vlan990) is down: Peer goodbye received
005333: Jan 19 11:30:30: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.12 (Vlan990) is up: new adjacency
005334: Jan 19 11:30:30: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.11 (Vlan990) is up: new adjacency
005335: Jan 19 11:30:30: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.1 (Vlan990) is up: new adjacency
005336: Jan 19 11:30:32: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 65001: Neighbor 10.190.254.21 (Vlan990) is up: new adjacency

NX7000 - MTU Size

Hello,
I configured 4 port channels with mtu size 9000. The VM engineers requested me to configre the same mtu size on the vlans assiged to those 4 port channels. I wasn't sure if I needed to configure the MTUs on the VLANs since I already configured them on the port channels.
My question is, do I need to set the MTU size per VLAN if I already set it up on the port-channel?
Thanks in advance, ~sK
Example of the port channel and vlan config:
interface Vlan101
ip address 172.22.101.253/24
ip router eigrp 10
hsrp version 2
hsrp 101
    preempt
    priority 90
    timers 2 6
    ip 172.22.101.254
ip dhcp relay address x.x.x.x
ip dhcp relay address x.x.x.x
no shutdown
delay 2000
interface Ethernet6/1
description ESX-BC-11(#1)
switchport
switchport mode trunk
switchport trunk allowed vlan 68,71,100,108-113,119,136,152,175
switchport trunk allowed vlan add 202,214,221,223,231-232,241,243
switchport trunk allowed vlan add 300,800,1200,1300-1302,1321,1400
switchport trunk allowed vlan add 1600,1800,3712
spanning-tree bpduguard enable
mtu 9000
channel-group 11
no shutdown

Hi,
The ESX host will be able to communicate with other systems in the same VLAN with 9000-byte jumbo frames, but if the traffic from the ESX host will be routed via the SVI i.e., interface vlan 101, then you will need to change the MTU on the SVI with the mtu interface sub-command, where is the maximum frame size you want to allow.
If you don't set this, when the ESX host tries to route any jumbo frames, the router will respond with an ICMP Type 3 Code 4 message (Fragmentation Needed and Don't Fragment was Set) causing the host to reduce the maximum packet size it sends.
Regards

Link Aggregation dladm on T2000 with 2 e1000g. How can i change mtu size

Hello
I made a Link Aggregation on a T2000 with e1000g1 & e1000g2 successfully.
Now i want to raise up the mtu size to mtu 9000 for the aggregation.
I tried /etc/hostname.aggr
mtu 9000
unsuccessfully- MTU size still 1500
/kernel/drv/etc/e1000g.conf
setting Max Fram Size for 1 2 3 interface to 2(upto 8k)
also not successfully
MaxFrameSize=0,2,2,2;
# 0 is for normal ethernet frames.
# 1 is for upto 4k size frames.
# 2 is for upto 8k size frames.
# 3 is for upto 16k size frames.
# These are maximum frame limits, not the actual ethernet frame
# size. Your actual ethernet frame size would be determined by
# protocol stack configuration (please refer to ndd command man pages)
# For Jumbo Frame Support (9k ethernet packet)
# use 3 (upto 16k size frames)
Has someone an idea?
thanx for advice

Bug is described:
http://sunsolve.sun.com/search/document.do?assetkey=1-1-6326664-1
Solution is
T-Patch 125020-01
Message was edited by:
sunibk

IPSEC MTU size should be 1500 or 1400 with ipsec 60 overhead?

Our l2l vpn connections have different MTU sizes. The VPn connection is established but I only get inbound traffice but no outbound traffic. Should the path mtu be 1400 or 150 for the VPN?
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Just keep pinging the other end ip address with ping x.x.x.x -f -l 1500.
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HTH
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MPLS MTU size

Hello,
Please correct me if I am wrong. The MPLS MTU size is 1518 to 1520 and the normal MTU size is 1500, So does it means that while configuring the MPLS network on the Switches attached with the MPLS CE router we MUST have to configure the MTU size to 1520 or not.
Please confirm

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http://bintelligencegroup.wordpress.com/

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Please let us know if you have further questions.

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