Cisco Switching/Routing :: 9216 Changing MTU Size
Sep 23, 2012
I have VLAN X with MTU 9216 on Switch-A. I also have VLAN Y with MTU 9216 on Switch-B. But not their SVIs are MTU 9216.They are not communicating to each other on packet size of above 1500. This is because SVI VLAN X and SVI VLAN Y connect to each other through SVI VLAN Z (Point-to-point Layer-3 connection between two switches). Although SVI VLAN X and SVI VLAN Y communicate through SVI VLAN Z, this inter-link port is a trunk port carrying other VLANs but VLAN Z is a native vlan for which SVI VLAN Z is defined.In order to make it work.
1. Do I need to change SVI VLAN X and SVI VLAN Y to 9216?
2. Change MTU for VLAN Z and SVI VLAN Z to 9216?
3. DO I need to change MTU sizes for other VLANs that are on TRUNK port?
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May 17, 2012
I have the Cisco 3560 switch. I can ping both from switch to server or from server to switch. However, I cannot ping with large size, for example,
ping 192.168.1.1 size 10000 (failed all).
I can ping 192.168.1.1 size 5000
(the size allow between <36-18024>)
It's normal or a problem with the cable or something else? Because I have the error about working with MSSQL server 2008 R2, the error is:
[DBNETLIB][Connection Write (send()).]General network error. Check your network documentation
OS: Microsoft Server 2008 R2 Standard
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Feb 7, 2011
I am trying to determin if Jumbo frames are enabled on out Nexus 7000, and I am getting mixed info back from the swtich.I looks like the system jumbo MTU size is 9216 by default, but the interfaces all say the MTU of the interface is 1500 bytes. According to this article, the interface MTU should read 9216 is the jumbo frames are enabled globally. Is this correct. Is there a way to verify if Jumbo frame support is turned on? [code]
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Oct 21, 2012
I have Catalyst 6509 E with redudant SUP720-3B (and MSFC3) running 12.2(18)SXF6 IP Services Lan Only IOS (this IOS requires 512MB DRAM and 64MB of flash) SUP has 512MB DRAM (458720K/65536K) and 512MB sup-bootdisk:, but, there is65536K bytes of Flash internal SIMM (Sector size 512K).
My question is can I put 12.2(33)SXJ3 IP Services Lan Only IOS to this 6500 because this IOS requires 512MB DRAM and 512MB od flash?This is "sh ver" and "dir all-filesystems" of my 6500:
cat6500#sh verCisco Internetwork Operating System Software IOS (tm) s72033_rp Software (s72033_rp-IPSERVICESK9-M), Version 12.2(18)SXF6, RELEASE SOFTWARE (fc1)Technical Support: [URL] Copyright (c) 1986-2006 by cisco Systems, Inc.Compiled Mon 18-Sep-06 23:59 by tinhuangImage text-base: 0x40101040, data-base: 0x42D90000
ROM: System Bo
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Jan 1, 2013
I have a new 881 router and am simply trying to change the ip address from the default 10.10.10.1 to 192.168.15.1
I tried doing this both in the CCP Express app loaded on the router, and also using the desktop CCP client. I can change other parameters without any problems, but when I change the ip address of the vlan the program hangs (as expected since the ip address should be changing). I then try to open it back up and reconnect but get no response from the router.
I can ping it no problem, and the http server is running according to the serial terminal.
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Oct 2, 2012
We have two 6500s. One is running in power redundant mode and the other is running in combined mode.We need to change the one running in combined mode to redundant mode to ensure it can run ok on one supply if needed but I have a couple of questions.
1. Assuming that we are not oversubscribed on the power allocated, does changing the mode cause any disruption?
2. The switch running in combined mode seems to have allocated some power for an "Inline Local-Pwr-Pool" which is not allocated on the switch running in redundant mode (see attached). Does this allocation will be needed if we change the power mode?
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Sep 5, 2012
I have a MPLS cloud in our data center. I want one network coming into our core router to have a different default route than the other networks coming in. I'm getting hits on the acl but the route isn't applied and goes to the default route that is configured in the router. I have other PBR for setting local-preferences and as-paths and they are working fine.
The router is a 7206 Version 12.4(11)T3
!
ip route 0.0.0.0 0.0.0.0 1.2.3.4
!
ip access-list extended 2nd_Default_Route
[Code].....
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Nov 7, 2011
I just tested IP SLA with tracking on a 3750 12.2(46)SE. And the configuration was simple enough and tested fine for redundant static routing: [code] Then I tried to do the same on a 3560 switch running 12.2(55)SE3. ip sla went in fine. But when I went to put in the track I was presented with "list boolean and" (for example) after the track and the identifier.I tossed in the ip sla "10" as the object. But shopw track shows the boolean AND as down. I don't get why the track feature is different in two switches so close in IOS version. How do I get the 3560 to track the ip sla as my 3750 does?
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Aug 27, 2012
I am going to change a running 6500 switch. I am missing a best pratice doc for changing a cisco switch configuration. My question is if a startup-config has an error (due to typo mistake, or due to comands not supported on latest IOS) and I do copy tftp startup-config then what will happen ? I want to make sure when I do "reload" the switch then it should boot normally with the latest startup config !
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Oct 24, 2012
I have a client who is changing their management IP scheme as a bridge to replacing equipment and much of the old equipment (Catalyst 4000) is running CatOS and I am a bit weak in CatOS. The existing Management IP is setup as follows:
set interface sc0 1 192.168.252.209/255.255.255.0 192.168.252.255
set ip route 0.0.0.0/0.0.0.0 192.168.252.1
What we want to change this to is as follows:
set interface sc0 110 192.168.197.209/255.255.255.0 192.168.197.255
set ip route 0.0.0.0/0.0.0.0 192.168.197.1
The devices are spreadout over a large area and visiting each device is almost out of the question due to a time deadline I was wondering if I run this set of commands will this allow me to keep a remote session (SSH) running until the change is complete?
set ip route 192.168.197.0/255.255.255.0 192.168.197.1
set interface sc0 110 192.168.197.209/255.255.255.0 192.168.197.255
set ip route 0.0.0.0/0.0.0.0 192.168.197.1
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Apr 18, 2012
I have a 3560 switch with the following ports config [code] I would like to use theses ports on a different vlan to connect 4 pc's to them. Can I just remove them from the vlan, remove the trunk switchport and set up on the vlan i want them on with no trunking?
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Feb 25, 2012
I have 3750 Switch and need to activate the ipservices on it , it is need a license file to switch from ipbase to ipservices , if i installed the ipservices image from cisco site , do i still need an activation key to use it??
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May 15, 2013
we ordered a data e-delivery PAK L-SL-29-DATA-K9= (FOR A 2900 SERIES ROUTER) but after we received the PAK we discovered that the client actually has a 1900 router. Any easiest way of rectifying this mistake so that we can use the PAK on a 1900 series router?
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Oct 14, 2012
We have two 6500 core switches and one(primary) of them is running in VTP transparesnt mode and the other (secondary) one is running in VTP client mode. I would like to change the VTP mode of the second switch to transparent mode. Would it cause any issue. I guess i have to create VLANs onto the switch.
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Jul 9, 2012
I have 2 SG300 switches, in layer3 mode, lag'd together for high availability, serving 2 Dell R815's and a Dell Equallogic 4100 for virtualisation. I have setup a number of vlan's, network traffic, mgmnt traffic, iScsi, vMotion etc and they seem to work.
However, Equallogic unit suddenly became unavailable to view for managment yet maintained iscsi traffic for the servers ok. After much head scratching, noticed that one of my SG300's had the vlan ports assigned to various vlans had *automagically* changed there assignment, ie tagged changed to excluded, but only for one of the iscsi traffic connections and the mgmnt port, both coming from the Equallogic, the other iscsi continued its assignment fine. The other SG300 hasn't changed. Guaranteee no one has been into change it and no changes have been made to Dell servers or Equallogic.
Q. Is there any circumstance where the switch can change the port setup itself? or is there any external circumstance that would trigger that change either?
This has now occured twice. The setup is running as a test lab, not in production until all setup is complete, then it will replace our existing harware.
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Feb 5, 2012
I've got a 3750 stack with a 3750-48p being switch 1 and a 3750-12s being switch 2 and switch 2 is the master. I would like to change the stack member numbers. I would like the 3750-12s to be switch 1 and the 3750-48p to be switch 2. I undertand I will have to reboot the stack for the change to take affect but here are my questions:
- How would this change affect the stack running-config ?
- will the switchport config follow the change ?
switch 1 provision ws-c3750-48p
switch 2 provision ws-c3750g-12s
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Dec 22, 2012
I am having trouble after creating a management vlan (99) on a 3550 switch.I have configured the vlan (99) and given it an IP (192.168.1.100) and a default gateway (my router address - 192.168.1.99).I can ping to the switch from a PC and vice versa. The management VLAN IP is fine but now I cannot ping to the router from either the PC or the switch.It seems that just by adding VLAN 99 with it's own IP address has now prevented pings from the switch/ PC to the router ?Due to the fact that I have created a new switch management VLAN with an IP, does this mean I have set up the router as a 'router on a stick' scenario ? [code]
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Oct 30, 2012
we have 6500 series switches by default all port channel loadbalancing is src-dst-ip.Now we have a requirement to change LACP load balance method to src-dst-port.
1) If we change LACP loadbalance method whar are the effects we are going have on our core network and all the existing servers
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Oct 24, 2012
I am installing a several new Cisco VM servers. The VM hosts are losing connectivity when we apply the etherchannel config in the core stack. VMware has stated that the etherchannel load balance needs to be src-dst-ip in order for the etherchannel to work.However, my current stack has 2 etherchannels configured to other switches through out the bldg in network closets. The current load balance configuration is src-mac.My question....when I make the change to src-dst-ip, will my network connectivity go down? I saw there was an older article on this that doesnt provide an answer just a work around. Here is the article. [URL].
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Nov 22, 2011
I am getting ready to make changes to our spanning-tree configuration in the data center. In familiarizing myself with the network I noticed that our core switch (6509) wasnt the spanning-tree root for the datacenter.
When I enter the spanning-tree priority command on the central 6509, will it be a hitless change (i.e. will there be any disruption to the network) ? All switches are connected to the core/central 6509 by a direct connection.
I know that when I change from pvst to rapid-pvst that the network will bounce because of the change in configurations to all of the switches.
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Sep 24, 2012
1) current switch have below mentioned switch stack details
.
switch#sh switchSwitch/Stack Mac Address : fcfb.xyz.8b80H/W CurrentSwitch# Role Mac Address Priority Version State----------------------------------------------------------*1 Master fcfb.xyz.8b80 10 0 Ready3 Member 2893.xyz.3180 1 0 Ready
2) I am in process of changing switch member number from 3 to 2 , I executed the command on the global config mode " switch 3 renumber 2 "but I yet to reload the switch .
here I have I doubt . as currently the ports module are fas 1/0/1-48 and fas 3/0/1-48 under respective vlan . once I reload the switch is the switch port module number will get change to fastethernt 3/0/1-48 to fastethenet 2/0/1-48 ??? . if it happens the vlan configuation which configured on the fas 3/0/1-48 module also get configured automatically or I need to configure manually
3) as i said i have execuated the command : "switch 3 renumber 2 " , how to remove this or revert the change , as i checked in the running config this command not exist .
switch ( config) # switch 3 renumber 2WARNING: Changing the switch number may result in aconfiguration change for that switch.The interface configuration associated with the old switchnumber will remain as a provisioned configuration.Do you want to continue?[confirm]Changing Switch Number 3 to Switch Number 2New Switch Number will be effective after next reboot
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Nov 28, 2012
I have a pair of data center core 6500 is running a single EIGRP AS with the standard core redundant cross connects. Recently an SVI sub net was expanded from a /24 to a /23 and dropped out of the EIGRP routing table. Subsequent trouble shooting lead to the router id being one using an IP address that is no longer active IP address.
Reviewing old configurations I found, that year ago, the ip address used for the EIGRP router-id (10.100.106.3) was removed from the active interface and changed but the EIGRP router-id was not updated. The switch has not been rebooted since, no loop back is configured and there is not a higher IP configured on an active interface. Reviewing documented material on it, I cannot find anything specific on this condition but do see in the discussions on duplicate IDs, that new route updates can be a problem. I know how to update the router id but I am looking for confirmation on what would be the impact when I add a new loop back and manually configure the router-id under the EIGRP process with the new loop back IP.
My assumption is an EIGRP update and route re convergence with the standard 90 seconds of outage. How to confirm this is assumption is correct? I have no test bed to find out myself without doing this on the active cores.
show version Cisco IOS Software, s72033_rp Software (s72033_rp-IPSERVICESK9_WAN-M), Version 12.2(33)SXI5, RELEASE SOFTWARE (fc2) show inventory NAME: "WS-C6504-E", DESCR: "Cisco Systems Cisco 6500 4-slot Chassis System"PID: WS-C6504-E VID: V01, SN: <deleted> NAME: "1", DESCR: "WS-SUP720-3B 2 ports Supervisor Engine 720 Rev. 5.3"
PID: WS-SUP720-3B
EIGRP configuration is pretty basic:
router eigrp 10
network 10.0.0.0
redistribute static
passive-interface Vlan110
passive-interface Vlan80
[code]...
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May 8, 2012
We have a new ASA5585 as an internal firewall that will slowly replace our aging FWSM. For optimum performance it was adviced on the FWSM to set sysopt connection tcpmss to 0, even though using MTU of 1500.
On the new ASA are we now going to enable MTU of 9216 for the contexts. The ASA is running in transparent multicontext mode. I read this here:[URL] which advises against setting the tcpmss to 0. But if I understand it correct, that means that the MTU of 9216 is useless, right?So in our case it would be needed to turn of the tcpmss feature to actually use the higher MTU?
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Mar 25, 2012
Will there be some pause in traffic on formed ether channel interfaces (4500E switch), when i will change the default ether channel load balancing method to src-dst-port (or any other non-default method)?
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Feb 13, 2013
I have two WLC version 7.3.101.0 with the standby unit having HA-SKU. I have tested the AP-SSO functionality without any problem in lab with direct connection on RP port between two WLC. Once I brought them into data centre in separate location (latency is less than 10ms between the two DC), the standby unity always went into maintenance mode. The booting process on standby unit went to maintenance mode as shown below:
Management Gateway and Peer Redundancy Management interface are not reachable.Entering maintenance mode.
I have checked on the core switches at 2 data centre that the two WLC RP ports are connected to same VLAN and it is spanned across MAN link (10GB and less than 10ms delay). The spanning tree on those ports are forwarding as well.I have rebooted the second unit but no luck.The interface between two DC is using MTU 9216 which I do not think would cause this issue.
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May 26, 2013
What is the size of the routing table in the 800 series?
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Dec 15, 2011
As a part of a major network cleanup/standardization project I have been working on for several weeks, I am now looking at spanning-tree and trying to get my company into line with Cisco Best Practice. I currently have 3 switches in the data center that are spanning-tree root for different vlans. Before I changing vlan priorities in spanning-tree, I feel that I should change from PVST that everything is on now to Rapid-PVST. To minimize the momentary network disruptions from making the change, should I do the edge switches first and do the switches in the data center at the last ?
Related to this process is something that I want to do probably after the PVST to Rapid-PVST change. I am going to manually set the vlan priorities for each vlan on the main core switch. Assuming I set the vlan priority for each vlan on my main core switch (6509) to 4096, should I set the switch I want to be the backup to 8192 for each vlan and then set the edge switches to something like 12288 to keep them from getting up in the spanning-tree hierarchy and for general principle to leave nothing to chance ?
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Mar 12, 2013
I received the following info from Cisco's TAC and wanted to inquire further before I start reconfiguring the switch:
In a redundant Sup-6E setup, the following configuration is supported :
- 1 TenGig uplink on Active Sup and 1 TenGig uplink on Standby Sup
- 1 TenGig uplink on Active Sup and 2 Gig uplinks on Standby Sup
- 2 Gig uplinks on Active Sup and 1 TenGig uplink on Standby Sup
- 2 Gig uplink on Active Sup and 2 Gig uplinks on Standby Sup
If you invoke shared backplane mode, the following configuration can also be supported:
- 2 TenGig uplinks(blocking) on Active Sup and 2 TenGig uplinks on Standby Sup
- 2 TenGig uplink(blocking) on Active Sup and 4 Gig uplinks on Standby Sup
- 4 Gig uplinks on Active Sup and 2 TenGig uplinks(blocking) on Standby Sup
- 4 Gig uplink on Active Sup and 4 Gig uplinks on Standby Sup
Here's the command and information about the "shared-backplane" mode :- [URL]
Currently, we have 2 SUP 6-Es(Module 5 - Active and Module 6 - Stand-by) setup in a redundent mode. I am planning on changing the redundent mode to the shared backplane mode so I can use 2 TenGig converters to uplink 2 access-switches. We purchased 2 TenGig converters and here is how I am planning on using them:
1- One will be used to uplink to two 3750 switches(stacked)
2- One will be used to uplink to a 2960 using a Gig SFP
My questions are:
1- Do I have to install the 2 TenGig converters(4-Gig Uplinks) in the same Module? Or can I use one one in module 5 and the second one in module 6?
2- Will changing the redundant mode to the shared backplane mode require rebooting the switch or disrupt the funtionality of the other linecards?
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Feb 6, 2013
I need the capability to log into the 3g/4g modem and change the Wan IP address. Doe anyone know of a 3g/4g modem that allows you to do that. My other option would be to disable the wireless radio on the 3g/4g router and connect my Linksys Wireless router that I know I can log in and change the WAN Ip. It looks like to me that this model below would allow me to do that?MBR1516 Will turning off wireless radio on the 3g/4g router completely turn off all routing or could there be a conflict with my Linksys wireless router?
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Jul 15, 2012
well i had the same problem because i got bored and i was like hmm i wonder if i can change my IP and i tried it and i had the same problem but when i did system restore it still did not work, now i have to get a new operateing system...
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Jun 15, 2011
I recently bought a tenda w548d Version 2.0 Adsl2+ Modem router. it worked fine with its default settings and wired connection was ok when i chose DSL uplink while installing its driver from CD. But it couldn't connect wireless. There were strong signals but connected computer couldn't get access to the internet. so i tried using ethernet uplink instead of DSL uplink while reinstalling the software Since then the light of ADSL never lights, even it never blinks. now the software on the cd can connect to the router. i cannot access its settings using IP address in browser, the page wouldn't load. I am so worried. Can i revert the setting back to dsl uplink?I can connect to the internet very smoothly using my old router so you can't blame my phone line or lan wire. I have tried reset the new router many times but still the ADSL light never lights up. And the ADSL light is ok because when i turn the router on, it lights with all the others.
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Jun 11, 2011
How i can change my ip address without changing my internet connection??
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Feb 19, 2012
I have a CANYON Wireless N Router CNP-WF514N1A. It was working properly, but I changed its deafult password to my own . (192.168.0.1 -> wireless security -> new pass -> okay -> reboot computer ). After I restarted the computer, the router stopped working. The lights on it are fine, and if I plug the net cable into the computer I have internet too. The problem is, if I plug the cable into the router, I don't have internet. And I can't open 192.168.0.1 either.
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