Cisco VPN :: 7206 VXR VPN And MTU Size?
May 12, 2011
I have two 7206 VXR routers with the VPN Service Adapter either side of a leased line (i.e. no provider between, pure layer two connectivity)A requirement is that traffic traversing the link is encrypted so I've configured an IPSec VPN between the two endpoints.During load testing we noticed a very severe performance hit when the VPN was enabled, disabling it again saw we were able to use almost 100% of the 1000Mbs line. The performance hit looks to be due to the increased MTU size when using IPSec, possible due to fragmentation.
I've read that the 7206 VXR can support 980Mbs (or there abouts) of throughput using AES providing the MTU size is 1400.Configuring this manually on each server in each data centre isn't feasible.As the link is effectively a point to point and we have control over the MTU size between the two routers, what options are available to increase the performance when the VPN is enabled?
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Dec 3, 2011
I need to know the MTU size on my 1841 wireless connection.My router connects to the internet via a adsl connection wich is sed to MTU 1492.Internet works fine on wired ports. Although when i connect to my wireless SSID(bridged setup) i manually have to set up the MTU on my OSX machine in order for my connection to behave properly. When set to automatic i have serious fragmentation issues. Is there a way to set the MTU size for my wireless module connections in order for MTU to be 1492 or lower in order for my mac to get the settings automatically? [code]
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Jun 28, 2011
I have a 4402 being used as a dmz anchor and we use WCS to allow our Helpdesk to create lobby ambassador accounts. Recently they have been getting error messages when attempting to create accounts. I am seeing the database maxxed out at 2048. The docs state database entries are made up of mac filters(don't use)..ap mic/ssc(don't use)..Dynamic interfaces(minimal) management users(2) local netusers (100 approx)..and excluded clients(none). So the numbers don't add up.I am on 4.2.61.0 code.. I will say also that WCS shows alot more netuser accounts than my anchor does but no where the numbers to max out the database. Is there some other criteria that hits against the datasbase number?? And what can I do on the WCS to insure it si synch'd up against the dmz anchor other than a audit..
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Feb 9, 2011
SSH is not working in Cisco 7206 VXR Router. I have configure
Hostname
Ip Domain name
Crypto key generate RSA
IN Line VTY 0 4
transport input preferred SHH
transport input telnet SHH
But stll it is not working. I am getting invalid crc recieved in packet.
Current IOS running is 12.3 (19) Enterprise 3des
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Mar 2, 2011
I am attaching my current network topology, My problem is that i am having mpls & p2p link terminated on the 7206 router left side of diagram. now my problem is if i apply PBR on this 7206 router & tracer any host which are on right side of the diagram, it drops on IP 10.1.1.1..ideally it should go to my Core switch on right of the diagram.
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Apr 8, 2013
I was asked to performe upgrade from acs 5.3 to 5.4 (vm), but i noticed that someone installed it on 80gb partition and there is 500gb as one of the requriments in upgrade and install procedure. What is strange to me is that "dir disk:" command shows such an output: 5165345067 bytes available.And under ESX i see 80gb partition. Anyway, is there any way to extend partition size to 500gb? Can I just change it under ESX? Is there any procedure to take under ACS console?
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Oct 28, 2012
This is a bit of an odd question because it's about a problem I ran into a year or so ago, but I wasn't aware of these forums at the time, so I thought I'd run it past you all. Unfortunately that means I can't reproduce the problem right now, so it's kind of a theoretical question.
A while ago I tried to deploy an sg300-28 in L3 mode as the "core" switch in our ~70-person office, with static routes across 5 vlans. There were probably around 250 devices on the network in total when you include phones, virtual machines, mobile devices, and so on. Over the deployment weekend things worked fantastic; when everyone came in on Monday, network performance was terribly slow.
So my theory at the time was that the switch's (L3) arp cache was full -- if I pinged a host on another vlan, the switch would send a new ARP request every second ping. We scrambled a Linux box to act as a router and disabled the L3 functionality on the switch, and it's been fine since. However, in the months since then, we've observed some STP misconfigurations, which leads me to wonder if it wasn't an ARP table size issue, but rather a topology issue. But moving routing to a different box did solve the problem immediately.
The switch has been fine as our core switch. The MAC table on that switch right now has 358 entries (we've grown since this happened). It was just on level 3 that it wasn't keeping up.
Does this ring a bell? How many arp table entries can an sg300-28 retain?
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Feb 16, 2011
How many Ap's I can have in a 541N Cluster? I have heard 6 or 10.
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Nov 22, 2012
We have lms 3.2 that we are facing a problem with it. When we start the server the EDS-GCF log file size start to increasing rapidly until it consumes up all free space and it only stops when we stop the Daemon Manager service. I tried to do the pds how command but I get no output from it. I included the portion of the EDS and EDS-GCF log files. i searched and didn't find the cause of this error.
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Jun 8, 2013
i have LMS 4.2 in Network with 100 devices, all of my devices have ACL so, there are too many logs in syslog
after a while the size of the log files in /var/log files (boot.log, messages.log) going to have huge size, something about 20G for each one
I'm looking for a way to reduce the size, is it possible to use Log Rotation or not?
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Jun 13, 2011
I have a Problem with an an ACE4710 Setup. Between my 2 Ace's there are Switches which don't Support Jumbo Frames - Is there a way to configure the Interface on the ACE to an Standard MTU Sive (15xx) ,I'm using SW-Version A3(2.7).
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Nov 13, 2011
I've created a Tunnel between a Cisco 2811 router and a Switch 6509, the tunnel works fine. However, I would like to run Multicast down this tunnel to avoid using a non-supported 3rd party network device that doesn't support multicast. Some of the multicast packets are above 1500 bytes. I would like figure out why the 6509 tunnel does not support frame sizes over 1500 bytes and the 2811 router does. I have applied ip mtu 1576 but this does not really come into play as the packets are UDP. problems seen below:
See the difference with MTU sh int tunnel1 - why is this
Switch config (s72033_rp-IPSERVICESK9-M), Version 12.2(18)SXF13)
interface Tunnel1
ip address 10.210.183.14 255.255.255.252
ip mtu 1576
[Code]....
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May 26, 2013
What is the size of the routing table in the 800 series?
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Aug 17, 2011
I have two branch offices connected with cisco routers(WAN link, leased line 2mbps). I am the NetAdmin for branch A. Sitting on branch A router or from systems behind the router, i can ping my branch B router or systems upto packet sizes of 1450bytes only. If i make packet size as 1500bytes, i cannot ping any of my systems in branch B and vice-versa.With packet size 1500 bytes, i can ping upto the serial interface of my branch A router. NetAdmin at brach B says they are no QoS configured which prevents ping at packet size of 1500 bytes. I don't have rights to access my brach B router and check the configuration. I am not able to pin point whether it is some configuration issue at my brach B router or ISP issue.
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Feb 24, 2011
I am having a Cisco 7406 VXR router. I want to know what is the max. MPLS link capacity that can be terminated on the link? We are planning to upgrade the MPLS link to 450 Mb..so was just wondering whether 7206 will support or not..
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Mar 9, 2011
I have a problem in understanding how LLQ is implemented in different platforms of Cisco.QoS should kick in only when there is a congestion in the link irrespective of queueing / scheduling (LLQ and CBWFQ).But in certain platforms like GSR and IOS-XR, LLQ is confiugred only with priority and police command not with "prioirity percent <value>" command. In priority and police command since policer is used, LLQ is always on even there is no period of congestion. Of course with police you can re-mark the exceed traffic to different marking but thats not the requirement in my case.
In platforms like 7206, LLQ is configured with "prioirty percent <value>" which works ideally only when there is a period of congestion. When there is no congestion, LLQ class can use scanvenge other classes as well.Would like to know is there any specific reason why there is a difference in the implentation of LLQ between different platforms of Cisco.
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Mar 14, 2012
I need to upload IOS c7200-advipservicesk9-mz.124-15.T16.binin 7206 NPE 400 router , As per cisco recommendation router should have DRAM : 256 MB ; Flash : 64I think my router contain only DRAM= 128 MB but not sure.
how much DRAM & Flash it contains.
Router1#sh versionCisco Internetwork Operating System SoftwareIOS (tm) 7200 Software (C7200-IK9S-M), Version 12.3(1a), RELEASE SOFTWARE (fc1)Copyright (c) 1986-2003 by cisco Systems, Inc.Compiled Thu 05-Jun-03 20:58 by dchihImage text-base: 0x60008954, data-base: 0x61E0C000
[Code].....
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Mar 9, 2013
I'm getting below error on 7206VXR (NPE-G1) with IOS "c7200-js-mz.124-3i.bin".Attempt to use contiguous buffer as scattered.[code]
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Mar 27, 2013
How can I enable Console port in 7206 vxr with NPE-G2 card installed, I need to use console from NPE G2 card.
The device turns on and status is also UP and I can also telnet to the device but I am not able to access the device through console port...
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Oct 1, 2012
i did in past a lot of L2TP connection between two end point. in this case ans with 2911 series with ios 15 and DATA license Activated. the l2tp session does not establishe between a this 2911 and 7209. Attached is topology file and bellow the configuration of both router.
PE 2911
l2tp-class l2-dyn
authentication
password 123456
[Code]....
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Mar 4, 2012
I have a lot of cisco 7206 vxr deviceses. I have a high cpu problem.I have a 7206 vxr g2. I used to use ebgp for three upstream carrier. I used to bgp full route table method. I have about 800 Mbps active traffics and behing the router about 1600 active customers.
How can I trouble shoot this high cpu problem?
#sh int gigabitEthernet 0/1
GigabitEthernet0/1 is up, line protocol is up
Hardware is MV64460 Internal MAC, address is 000c.cf1d.d01b (bia 000c.cf1d.d01b)
Description: ***** GW Interface *****
[Code]....
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Apr 24, 2012
In Cisco 7206 VXR (NPE-G2) router , the CPU utilization is at an 80-90% always , but none of the process is consuming not more than 1%. In the show stacks output we are observing network interface interrupt is called very frequently. so what does network interface interrupt is about. Logs for the reference: show process CPU sorted
CPU utilization for five seconds: 88%/88%; one minute: 89%; five minutes: 89%
PID Runtime(uS) Invoked u Secs 5Sec 1Min 5Min TTY Process
1 0 72 0 0.00% 0.00% 0.00% 0 Chunk Manager
2 20020000 17159 1166 0.00% 0.02% 0.01% 0 Load Meter
[Code]...
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Jul 3, 2012
I am connecting a cisco device with huawei device. The issue is when i ping with normal size packets (56 bytes) its ok. But when i increase the packet size above 1500 it doesnot works. MTU on both size is configured as 4096. I have also checked by varying MTU size, but still the same.
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Mar 24, 2011
I am currently trying to upgrade a 2800 series router to the latest IOS. I have loads of space on the router but the issue seems to be that Pumkin can't handle the size of the file. Keeps failing and saying that I might want to increase my block size. I increased it to the maximum size but still didn't work.
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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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Dec 18, 2012
I am low on available disk space to perform backups on my LMS 4.2 installation. Is there a way to force the appliance to recognize the increased disk space allocated by ESX VMware?
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Jun 12, 2011
imagine IOS image required size lists:DRAM 256 / 64 Flash
Then show ver on my router 3825 lists the below. Technically speaking the below should have the 64M flash required right? Why again it shows as 62592K and not 64000K?
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Nov 6, 2011
I'm having a problem with a context, I have two CISCO ASA 5550 (failover) and also we have the CISCO CSM to monitoring it, but since some weeks is showing a memory usage of 100% but then it drops until reach zero and then again the graphic goes up. This is the second time that the graphic shows this
I also check this on the CLI and i'ts fine because is showing the real percent, so my question here is why is showing this kind of behavior, I mean it was working fine before.
In the other hand I checked the secondary device and this is showing a 99% of used memory, but as the other one this graphic doesn't drop
I also checked via CLI and it says that it had the 99% memory used , Is there a way that i can put more memory on the context or what do you suggest that I can check on my firewalls.
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Nov 15, 2011
From one day to the next our UPM database (upm.db) has blown up from 4 Gb to 35 Gb.Data purging didn't reduce the size of the db.What happened ? And how can I compact the db again ?
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Dec 11, 2011
We have a site where uses are unable to login to an application. After running a packet trace on the traffic coming from the site to the server they are trying to access, the trace indentifies that the client pc is sending a window size of zero to the server, and it does this twice. So in essence the client is saying it is too busy. This is strange as all the other applications work for the users and it is only this one application that is experiencing issues. The only other issue is that there is some retransmitted traffic before the client sends window size.
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Jan 22, 2013
I think that our users are at the largest capacity for attachments, twice in the past week one of our users did not received important emails because of the attachment size limit. The problem is that the sender thinks we got it b/c there is no bounce back and we have no record of the email being sent. my question is how do i increase the attatchment size for incoming emails?
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Sep 13, 2012
how do i set limit on the log file size in ACS 5.3. I had the same issue with Nexus 1000v but there is a command that enables you to set log file nane and size. it is getting bulky.
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Jan 18, 2012
I have a scenario with a Cisco 6506 and a 7206. The 6506 is running BGP and peers with our data center router. The 7206 is a stub router off the 6506 and is used as an edge router for customer T1 circuits. I want to use OSPF between the routers to exchange connected and static routes. The problem I have is that static BGP null routes on the 6506 are overriding the OSPF routes being received from the 7206. Example: The 6506 is advertising a class C network 192.168.1.0/24 to our data center. The 6506 does not utilize the 192.168.1.0/24 network. It is only used on the 7206 for customer T1 circuits and is carved up into /29 subnets. So the 6506 has a static route: ip route 192.168.1.0 255.255.255.0 null 0. Today the routing is accomplished with static routes on the 6506 for the 192.168.1.0 networks on the 7206. Using OSPF the 7206 advertises /29 links back to the 6506, but when I withdraw one of the /29 static routes from the 6506, the /24 null route takes precedence over the more specific /29 routes and the traffic is black-holed on the 6506. how can I get the OSPF routes to look preferable to the /24 null route on the 6506?
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