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Sunday, March 25, 2012

Top 5 Tech Support questions for Cisco System's products - Weekly Update Mar 19th

The most actively discussed Tech Support questions on the web for Cisco System's products (Week of Mar 19th 2012)
  1. %C6KPWR-4-DISABLED: power to module in slot 4 set off (New fabric sync sequence not supported)Link
  2. Cannot Uplink/Daisy Chain Cisco 2960 S Series Switch to Cisco 3750 Switch
  3. Can an ACL itself has an implicit deny after it is executed on an ip range?
  4. Is there added value of having multiple BGP AS# for a single VRF on IP-VPN
  5. %C6K_PLATFORM-0-UNKNOWN_CHASSIS - 7600 stuck in RoMMon


Connectivity Problem or Packet Loss with WS-X6548-GE-TX and WS-X6148-GE-TX Modules used in a Server Farm

We are running these modules in my Cisco 6500 chassis and have a lot of connectivity issues. We lose network connectivity every 5-6 day at around the same time. We have (2) C7000 Chassis with HP VC-Flex 10 Modules connected via 20Gb LAB to each Cisco Cisco 6513 Switches. However, the OA Modules on C7000 are connected via 1Gb uplink to either 6548 and 6148 modules. We believe that this is causing the network connectivity issues.

What modules would you recommend to replace 6548 and 6148? These are meant to be used for 1Gb desktop connectivity, and not for Server Farm.

This is expected behavior when you stick an ACCESS switch-level line card and connect SERVERS. Both the 6148 and the 6548 weren't design for the server environment. This responsibility falls squarely on the 6748 (hence you won't find a PoE version of this card).

Please make sure that the client has no intention of upgrading to Sup2T. If the client has NO intention then go ahead and recommend the 6748 line card for the server farm. If they do have the intention to upgrade to the Sup2T, then just be warned that the 6748 will not be supported by the Sup2T until you upgrade the DFC/PFC card.

Also 6724 or 6748 (with DFC) would be fine. (NB: with a 6513 and sup720, only 5 bottom slots offer 40 Gbps).


Citation - This blog post does not reflect original content from the author. Rather it summarizes content that are relevant to the topic from different sources in the web. The sources might include any online discussion boards, forums, websites and others.

Thursday, March 22, 2012

3750-x POE Issue powering Avaya 4620 phone

We have a WS-C3750X-48PF-S switch that will not power up Avaya Model 4620SW IP phones. Following error is displayed:
*Feb 28 20:16:11.145 EST: %ILPOWER-3-CONTROLLER_PORT_ERR: Controller port error,
Interface Gi1/0/48: Power Controller reports power Tstart error detected (AIS-1
)do show power inline g1/0/48
Interface Admin Oper Power Device Class Max
(Watts)
--------- ------ ---------- ------- ------------------- ----- ----
Gi1/0/48 auto faulty 0.0 n/a n/a 30.0

Interface AdminPowerMax AdminConsumption
(Watts) (Watts)
---------- --------------- --------------------

Gi1/0/48 30.0 30.0

This is a known Cisco bug. Please click here for more information (Cisco login required).

You might try configuring this under the ports where the phones are connected "power inline port 2x-mode". This will require you to upgrade your IOS to 12.2(55)SE3 or 12.2(58)SE1.

The Avaya phone is in violation of the IEEE 802.3af spec and is providing too much inrush current, but that command allows for spikes in the inrush current and it might suffice as a workaround to get these slightly non-compliant phones to work.

There are two options of either extending the patch cable at the desk to increase the length to 30+ meters or replace the phones.


Citation - This blog post does not reflect original content from the author. Rather it summarizes content that are relevant to the topic from different sources in the web. The sources might include any online discussion boards, forums, websites and others.

Sunday, March 18, 2012

How can we tell if certain ios is later release than ios 12.1(13) E

"With Cisco IOS Software Release 12.1(13)E and later, VLAN IDs might be in the range of 1 to 4094, except in the case of reserved VLANs. With Cisco IOS Release 12.1(11b)E or later, you can remove VLAN 1 from a trunk port. Even after removing VLAN 1 from a trunk, the trunk interface continues to send and receive management traffic. For example, CDP, VTP, Port Aggregation Protocol (PAgP), and DTP all use VLAN 1, regardless of the existence of VLAN 1 on the port."

How can we tell if certain ios is later release than ios 12.1(13) E? For example if we have windows OS like windows 95. windows 98. windows 2000 etc we can tell which windows OS is most latest.

Please look at the number inside the "brackets". The higher the number the later.

If you have access to Cisco Software Downloads, it keeps "tracks" of what you are downloading. It will also "inform" you that you've LAST downloaded, for instance, an IOS for the 2960S version 15.0(1)SE and the latest one available is 15.0(1)SE2. Both versions are HTML links so if you click on the newer version the page will take you to the download page.

If you do a "sh ver" on the switch or router, it will tell you what version of IOS you are running. I can tell you that 12.1(13)E is pretty old. After 12.1 revisions came 12.2, 12.3 and 12.4. Now days for routers the latest is IOS 15 with multiple revisions.

Also if you access the downloads section on the cisco website and look for an IOS you will be able to see the IOS's list in order of their evolution.


Citation - This blog post does not reflect original content from the author. Rather it summarizes content that are relevant to the topic from different sources in the web. The sources might include any online discussion boards, forums, websites and others.

Thursday, March 15, 2012

Is Line 2 in Cisco 1941 by default?

Can someone please help explain the following found in Cisco 1941 running config

line con 0

password cisco
login
line aux 0
password cisco
login
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
password cisco
login
transport input all
!
line con 0, aux 0 and vty 0 4 are the default async / remote managament port I already know, but what is line 2 for? The router is running with Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.1(4)M2, RELEASE SOFTWARE (fc1), with ipbasek9 activated and has a VWIC2-1MFT-T1/E1 in WIC-0 and a WIC-1B-S/T-V3 in WIC-1


Line 2 command is default there with Cisco 1941 image but the use only when we want to configure the multiple Console or serial line .

i.e

Line 1 use Console port 2001
Line 2 use Console port 2022


Citation - This blog post does not reflect original content from the author. Rather it summarizes content that are relevant to the topic from different sources in the web. The sources might include any online discussion boards, forums, websites and others.

Wednesday, March 14, 2012

Unable to reset vty settings

We are having trouble resetting the 'line vty' settings for my switch. We have incorrectly configured the settings as follows and would like to change them back to default without resetting the entire switch. The current settings are:

Line vty 0 3
login local
line vty 4
login local
line vty 5
login local
line 6 15
login local

What we try to do is to put 'line vty 4' back to be included in the settings for 'line vty 0 4' and also want the same for 'line vty 5' to be added to 'line vty 6 15'. Can someone guide me as to how to reset these settings or add them together as requesetd.

When we try to run 'no line vty' we get an error that says 'you cannot erase lines 0 15' (or somethins along those lines)


Usually when line vty 4 shows up in the config differently from vty 0 3 it is because there is something configured differently on vty 4. I do not see that in what you posted. Similarly when vty 5 shows up by itself it is usually because something is configured on it different from the vty 6 15. Are you sure that there is not something else that shows up in the output of show run for these vty lines?

One approach that might work (but since I have not used it on the vty lines I can not say from experience what it will do) would be to try this:
default line vty 0 4
default line vty 5 15
This might set them back to their default settings and get them to show up together as you want.

Another approach would be to use the command
line vty 0 4
and then to configure any and all parameters that you would like to apply to the vty lines. And then do the same with
line vty 5 15


Citation - This blog post does not reflect original content from the author. Rather it summarizes content that are relevant to the topic from different sources in the web. The sources might include any online discussion boards, forums, websites and others.
 
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