This was very helpful. Any suggestion on books that deal with explaining basic but yet detail information that Cisco Press Books miss on? Or detail differences in all the versions of IOS to complement your post. Or would that be a waste of time for someone like myself which is seeking the CCIE path?
I can give some tactical options. Or look for the free PDF version at cisco. Then get busy reading! You can search based on feature, router model, etc, and learn what routers support what features. I had thought of writing one that was just a deeper version of this blog series, with more detail and specifics.
But it helps for the real job. Hope this helps a little at least! Hi Herman, Short answer is yes. The software versions on these are below the recommended by the INE spec. Where can I download IOS images as follows:. Or, do I need to purchase these images? If so, how much do they cost and where do I get them from? When I tried to download any X image from the Cisco website, I received a banner message advising me that I need a service contract.
Most used channels do not support a service contract, or if they do, it does not include any software upgrades, because behind the scenes that process cuts Cisco out of the loop. I know of no way today for you to upgrade the IOS on the routers you have already bought.
Check out the tables at certskills. My question is, is a running cadventerprisek9-mz. My main question would how much longevity you need once you move it to production.
Look at cisco. Looks like So, if the current I would not purchase a big ccie home lab but I just want to chose switchs and routers that will be useful for ccie lab I do not want devuces that will not be useful in future whats your advice and did your post applies for switchs also specifically I do find switchs with Thank you in advance. Hi Sadek, Thanks for the post. Made for a lot of cheap layer 3 switches. Anyway, you might try the forums at one of the CCIE prep company for a discussion of the current best L3 switches in terms of cheap, used, but useful.
Thanks, Wendell. I have been struggling to confirm if my lab will suffice. Routers which supports ios Hello, thanks for the article. My question, I have two xl switches and two routers. Do you think I could still use them to study for the new ccent and ccna?
Hi Zonet, Sure. For sure, if you already own them, get into them, start learning, and make progress. Then you can decide how badly you might want other gear vs. You must download the image for that particular model. As to IOS though, if you have an account with Cisco, you can find a lot of upgrade software for many switches and routers, at least in the I know that if I have I know that IOS But what confuses me is the following:. I thought this is the same thing required for all router e.
But I found that in Then I got confused! Are these versions for old routers e. Do these IOSs But I think I can give you a few insights. Then, searching on Cisco. EG, Cisco models X, Y, and Z, for certain calendar years, may have coincidentally supported the same feature sets by name. In those same years, other Cisco router models supported a different group of feature sets. Different models play different roles, and Cisco made feature sets that worked well for their customers for how they used those routers.
And the software update rights tie into those same service contracts. Not sure about the mapping of feature sets. Pick a model series, and see what IOS versions are supported. Conditions Under certain call scenarios, the Update method would have two call-info headers, one for normal remotecc info and one for security status. Workaround There is no workaround but it is not service effecting. Caller ID would be unavailable in certain instances. Symptom CME group pickup or pickup features do not work properly.
Symptom A monitor phone can change the monitored dn SNR number via myphoneapp application. Conditions Using myphoneapp on a monitoring phone can change the SNR target of a monitored dn. Symptom AnyConnect Client version 2. AnyConnect 2. This only pertains to the 2. Workaround Any of the following workarounds may be used:. The TCP sessions could be a telnet or H. Symptom SPAG2 phone would not register. Symptom No line or speed dial buttons are shown on the fallback skinny phone.
Workaround Attach side cars to the phone. Workaround Issue clear crypto isa. Symptom When using the copy ftp command to update IOS software issued on a router, it takes approximately 80 seconds before the file transfer begins. Conditions This is seen on a or series router, but is not seen on routers in other series, such as or Conditions This symptom is observed if a WAN outage happens when more than 40 calls are in progress.
Some random calls are then shown to be active when using the command show call active voice compact with Cisco IOS Release Symptom NULL is accepted as a name for class-maps and policy-maps. No error message is displayed. Conditions Create a class-map or policy-map with "" or " " or any other similar combination as the name.
Symptom Failed to get media source address for a stream in a DO call. Conditions Failed to get media source address for a stream in a DO call with rsvp. Symptom When using mgcp dtmf-relay type nte-gw, a sniffer trace will reveal that digits are sent both in-band within the audio stream and out-of-band dtmf-relay. Because of this, double digits can be seen in Unity and MeetingPlace. Workaround Use mgcp dtmf-relay type out-of-band. Symptom If a certificate map is changed or added to the trustpoint, the pub key cache for the peers is not cleared.
This makes it possible for a client which was connected in the past to reconnect again even if its certificate was banned by the certificate map. Conditions Only seen with IE8. Workaround IE6 can be used as a workaround. Some pages on server A automatically does a silent login to server B and gets the information required to generate reports. When using IE8 this login information does not gets properly propagated to the backend server B which results in redirection request to the login page from server B.
Symptom Tunnel sources get mixed up when tunnel interfaces are configured with serial subinterfaces as sources and the router is reloaded.
Conditions The symptom occurs only after a reload or when a saved configuration is applied to the running configuration.
Conditions Phone A does a call blast by calling pilot number xxxxx. All the phones start ringing till time out 60 seconds then call lands on the final phone B. Phone B answers the call and gets connected, then it checks for called number at Phone A. The final phone's number should be displayed. But the pilot number is displayed.
Conditions The issue occurs when ICMP path jitter operation is configured on the router with invalid source address. Platform is supB with Workaround Configure the SLA operation with the right source address. Symptom Application set window scale factor does not get used by the accepted connection, instead the scale factor set by the global command ip tcp window XXXX is used.
Conditions ip tcp window XXXX configured to a higher than value. Connection has window scale enabled on both sides. Conditions The router runs into low-mem condition due to mem-fragmentation in certain voip-perf testing. It has a known work-around and is not a problem as such unless similar level of bursty traffic with the peculiar size of request is generated as used in testing. Also, there is no support for iPhone and iPod safari browsers.
Workaround Page is displayed but quality is poor. Symptom The called name is not displayed on the caller sccp phone when the call is forwarded to non-sccp endpoint ie.
The called number is displayed correctly. Workaround Define the pool on the NAS or as a dynamic pool on the radius. Symptom When we load an FPM tcdf file on the router, a memory leak is seen. However, this is a one time operation and has minimal impact. This happens in all the advanced images where FPM is used.
This memory leak is not seen until we load a tcdf file. This issue is specific to the PI11 codebase. Conditions ipbasek9 is the only package enabled. Conditions Only for SBC proxy address configuration and only if either of the addresses is zero.
Symptom cme on cadvipservicesk9-mz. For example:. Symptom Queue-limit configured in ms is not displayed in show policy-map int output. Conditions This happens in a scenario where queue-limit is configured in ms in class-default. Symptom Chunk memory leaked while configuring the ip nat pool. Conditions While configuring the pool with subnet mask smaller than required length for the start and end ip address.
Symptom Using the command default dest-ipaddr for udp-echo, udp-jitter, and tcp-connect causes a device to crash. Conditions The symptom is observed with the command default dest-ipaddr. Workaround Do not use the command default dest-ipaddr. This sets the address to 0. Symptom A Cisco router may crash when configuring the object id in config-event-objlist subconfiguration mode. Conditions This symptom is observed when entering the cns config notify command.
Symptom NIOS watchdog timer times out. Conditions This symptom is observed when an MC modem is power-cycled. Workaround Reload the router. Workaround Once the phone state changes, it will reflect the real state to the blf sessions. Symptom The CME does not process the incoming sip message. Conditions Call forward scenario where incoming sip messsage is received. Workaround Configure : voice service voip no notify redirect ip2ip.
The IOS version is Workaround Use earlier IOS such as Remove voice source-group configuration. Conditions Happens when the CME is loaded with Workaround Call will flow through.
Symptom User can not press the button configured as trunk-dn monitor to pick up the parked call. Or user cannot press the button configured as M button to speed-dial.
Conditions Pressing the monitor button, no OP. Symptom Not able to configure call-forward system redirecting-expanded. Conditions Not able to configure call-forward system redirecting-expanded on a router. Symptom After a license upgrade from 48 to 64 user license on a UC, the Cisco series phone registration fails with the following errors in debug ephone register output:. The problem only occurs when the ephone tag value for this phone registration is 56 or higher.
Workaround Use an ephone tag that is of lower numerical value. Ephone 55 or lower will work. Symptom When shared line has 2 calls, and these 2 calls disconnect at the same time, the port might hang.
Symptom Build failure is happening for platform images. Conditions FXO ports are members of a huntgroup where the first member port is disconnected or down. Unconfigure max-retry.
Under each port, configure "timeouts power-denial 0" so that disconnected ports are moved to offhook state and will not be hunted. Symptom CPU profiling under interrupts is not reliable. Symptom A Cisco router reloads when trying to connect to irc. Conditions The symptom is observed only in the first 36 hours following a reload. Workaround Do not connect to irc. Conditions This happens when the CLI's parser chain was moved, hence missing them on the platforms. Need to ensure the parser chain is implemented as platform independent.
Symptom Consult transfer with third party sip endpoints results in one way audio when the third party endpoint has delayed response to resume request which includes change in rtp stream parameters i.
Conditions sip supplementary services refer is disabled. Symptom IP connectivity fails for the interface following extended pings from FastEthernet interface. The show interface command will indicate that the output queue is wedged:. No indication at this time that this is specific to these images.
This problem has not yet been seen on an interface in full duplex mode. Symptom Router reloads with a bus error and no tracebacks.
The installed IOS version is any Workaround There is no known workaround available. Subsequent calls through that same channel continue to fail with "resource unavailable" cause value equal to 47 even after DSP resources have been made available to handle the call.
The call must first fail with a legitimate DSP allocation error. Any call made through the same channel as the failed call will also fail. DSP allocation failures on gateway can be checked through the use of the exec command show voice dsp group all. The last line of the show command output includes a counter for "DSP resource allocation failure". This issue can also be seen in some cases upon bootup. When a gateway is reloaded, system resources will come up with a slightly different timing.
If, for example, a PRI interface comes up before the DSP resources have fully initialized, there may be a similar failure. Workaround The workarounds are as follows:. When the gateway comes back up, take the voice-port out of shutdown. An increase of almost 10 percent in CPU utilization is observed with every voice call.
Workaround Remove the AIM compression card from the motherboard. Outbound calls to the SIP provider have one-way audio. The internal IP phone can hear the remote party, but the remote party cannot hear the internal IP phone.
Conditions TNP phones with firmware 8. Workaround Wait for about a minute, and the port will automatically recover back to registered. Symptom A call from a night hunt forwarded to BACD dial by an extension to an ephone call forwarding no answer to voicemail goes to the night hunt number and not the last redirected number. The packets will appear as output drops on the ATM interface statistics. Under the PVC level, there are no drops.
The ATM interface s need to be bridge-group configured. The bridge-group is in forwarding mode. Symptom The call-waiting tone will not be generated and the caller ID will not be displayed for the second call to a phone connected to a FXS port. Configuring either caller-id enable or caller-id enable type 2 on the FXS voice port will trigger this issue.
Workaround Configuring caller-id enable type 1 under the voice port will provide call-waiting tone. However, caller-id will not be provided for the second call. This timer dictates how long a T1 CAS, wink-start endpoint must remain offhook before completing a wink.
Failure to expire the timer will cause the c to incorrectly classify a valid wink as invalid, failing outbound calls. Conditions This can happen when there is a brief period of increased CPU usage while a call is in the process of connecting. In other words, a small spike in CPU usage can cause the time to fail to expire, thereby causing a wink failure.
This may or may not help depending on the cause of the CPU spikes. A two way conversation is then established between Phone A xxx and Phone C zzz. Then the call is disconnected. With 8. Conditions If the calls come in a PRI or FXO interface, and a user on an active call on the octoline puts the call on hold while there is an incoming call, it will automatically answer the incoming call. Approximately 13 seconds later the second call is dropped. If the user requires to put a call on hold while a new call is coming in, they must wait until the incoming call stops ringing.
Symptom Memory fragmentation, no call accepted, no output for show run. Symptom A gateway may take an exception when receiving an inbound H call when the call is placed via ISDN overlap sending. Symptom Symptom A video call for a 3G H.
Also, in the media sent to the endpoint, the video port is set to 0 as the debug state. Symptom The dsp allocation signaling dspid command under voice-card on platform is not available. Conditions This issue is on platform alone. Symptom After upgrading to The amount of IO MEM allocated upon boot up of the router has not changed with respect to previous versions.
This change in memory consumption is expected due to the integration of new features. Conditions This defect is seen on Symptom Call is terminated after aborting the transfer attempt. Conditions This problem is observed if transfer-digit-collect is not configured or configured as new , the default. Workaround Configure transfer-digit-collect orig. Conditions c platform with HW crypto engine. Symptom Router continuously reboots. Conditions This symptom is observed when an NME is installed on the router.
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