Scripted backup of ESW series switches

We recently purchased some of the ESW-540 Cisco switches for some lower end access ports. I'd like to script the configuration backup using Kiwicat if possible, but haven't figured out how to either get into the cli, or config kiwicat to backup via webui.
With the SRW Linksys line you could hit ctrl-z and type lcli to get into the cli interface.
Anyone have any ideas?
Thanks..

Nothing to do with the UC - primary concern is standalone networks.
Real life case:
2 ESW switches in control room hooked up to SA540
Closet switches are SRW2008's
Port no more than two devices are supposed to go now has 4, add an SRW2008 to the desk location.
Now, it turns out that there is a badly behaved device at the desk - a video player that spews all sorts of traffic when it's playing that doesn't play nice with others. So I now need to set-up a VLAN crossing those two switches. Oh, and it turns out the customer decided to unplug an access point and plug it into that switch too which ended up causing a loop when the PC plugged into ethernet someplace else attached to the PC.
Tasks:
Ensure that the 2 SRW2008's have proper vlan assignments to setup a port vlan for that video server.
Issues:
Make sure you assign proper configs to both ends of each link
Make sure not to confuse one SRW2008 with another
If new vlan, make sure all other ports that need to see it can still see it.
Applications for CCA:
Visualize all VLANS
Document port assignments (i.e. where is the video server vs. printer on that last leg 2008)
More easily see port statistics across multiple switches
So after I did that work, I realized that the SA540 wasn't really up to being an aggregation switch too and made the ESW-540-48 into the aggregation switch which required some more changes - however CCA made it easy...
At another job, I have SA540 + AP541ns (upgraded from RVL200 + WAP54GP's) but if I had 300 series in CCA, I'd upgrade the SRW2024's and SRW2008's but without easy management tools, the labor cost will be too high to make their networks really managed.....CCA makes that layer of management cheaper.

Similar Messages

How to erase all configuration in Cisco ESW 500 Series Switches

Hi anybody,
Anyone show me how to erase or remove configuration file from ESW 500 Series Switches?
Thanks
Thuc

Hi Thuc,
The restart / reset function will allow for local or remote reset of the the unit to Factory defaults, see screen capture below. ;
Alternatively, the Switch can be reset by inserting a paper clip into the RESET opening on the friont of the switch.
Pressing the manual reset for 0 to 10 seconds only reboots the switch.
Pressing the manual reset for longer than 10 seconds results in the switch being reset to factory defaults.
does this answer your question, not exactly sure it does ?
regards Dave

Connecting two cisco ESW 500 series switches.

Hi Experts,
I have a basic knowledge of network and need some help.
I have two cisco ESW 500 series switches and i want to connect them together.
Q1 # Which type of cable i should use to connect these two switches CrossOver or fiber...What is the advantage of using Fiber over CrossOver. ?
Q2 # What are the marked ports in the image used for...???

tech spec,
Traditionally you would use crossover to connect switches. Most modern network devices have Auto-MDIX which allows the device to connect using either crossover or straight through.
The ports on the right can be used for uplink or as regular network ports. On the 10/100 versions the ports on the right are usually Gigabit, thus making them more suitable for uplink to another switch, etc.
Please mark this thread as answered or reply if you have any additional questions.
- Marty

Cisco 4003 series switch

Hi...All.
In cisco 4003 series switch i m getting error in post test its says , rtc failed, after that supervisorengineer wxx4012 LED status is Red.can any one tell me wt that means and hw to solve that problem.

plz fine the post test script...
003-B-Ground> (enable) 0:00.523556: Please set IPAddr variable
0:00.524147: Please set Netmask variable
0:00.524511: Please set Broadcast variable
0:00.525113: Please set TftpServer variable to do tftp downloads
0:00.525658: Network is not configured
WS-X4012 bootrom version 5.4(1), built on 2000.02.17 18:28:09
H/W Revisions: Meteor: 4 Comet: 8 Board: 2
Supervisor MAC addresses: 00:02:16:d2:5a:00 through 00:02:16:d2:5d:ff (1024 addr
esses)
Installed memory: 64 MB
Testing LEDs.... done!
The system will autoboot in 5 seconds.
Type control-C to prevent autobooting.
rommon 1 >
The system will now begin autobooting.
Autobooting image: "bootflash:cat4000.5-4-2.bin"
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
CCCCCCCCCCCCCCCCCCCCCCCCCCC#############################
Starting Off-line Diagnostics
Mapping in TempFs
Board type is WS-X4012
DiagBootMode value is "post"
Telling ApkPageMan that we have 12288 pages of memory
Loading diagnostics...
Power-on-self-test for Module 1: WS-X4012
Status: (. = Pass, F = Fail)
processor: . cpu sdram: . rtc: F
eprom: . nvram: . flash: .
temperature sensor: . enet console port: . switch port 0: .
switch port 1: . switch port 2: . switch port 3: .
switch port 4: . switch port 5: . switch port 6: .
switch port 7: . switch port 8: . switch port 9: .
switch port 10: . switch port 11: . switch registers: .
switch sram: .
Module 1 Failed
Power-on-self-test for Module 2: not present
Port status: (. = Pass, F = Fail)
Module 2 Ignored
Power-on-self-test for Module 3: not present
Port status: (. = Pass, F = Fail)
Module 3 Ignored
Exiting Off-line Diagnostics
Failed Module Bringup Process
Use 'show test 1' to see results of tests.
Cisco Systems, Inc. Console

New ESW-540 switch with cold start problems

Hi
A customer of mine is having serious problems with several ESW-500 switches.
He started a discussion under Netpro, but haven't received any answers. This might be the right group?
He wrote:
I have two new esw-540 switches (one 48 port and one 8 port),
which are making unauthorized cold starts and that gives me a lot problems.
(now it is about three switches)
I added:
Hi
My customer needs help with his problem.
Here is some more information:
There are three switches with the samHi
A customer of mine is having serious problems with several ESW-500e problem now, all with the same errormessages from his log
Ciscosw2 ESW-540-48   SN: DNI1452E71E SW Ver. 1.19 Boot Ver.1.0.0.04
Ciscosw3 ESW-540-24   SN: DNI1433E507 SW Ver. 1.19 Boot Ver.1.0.0.04
Ciscosw7 ESW-540-8     SN: CBT15230E9Z SW Ver. 1.1.19 Boot Ver. 1.0.0.07
From ciscosw7:
Nov 11 02:16:03 ciscosw7 %OS-F-MEMORY: OSMEMG_rn_free: Memory magic is invalid
***** FATAL ERROR *****
Reporting Task: BNJR.
Software Version: 2.1.19 (date 14-Jul-2010 time 17:12:34)
0x184e9c
0x182484
0x564110
0x392684
0x395998
0x568630
0x2df10c
0x2df654
0x2e1138
Nov 11 02:17:14 ciscosw7 %INIT-I-Startup: Cold Startup
And he sent me a new errormessage today:
Nov 13 01:38:14 ciscosw5
%SYSLOG-F-OSFATAL:
FATAL ERROR: BNJR: ABORT DATA exception
***** FATAL ERROR *****
SW Version : 2.1.19
Version Date: 14-Jul-2010
Version Time: 13:58:28
Instruction 0x2EFB04
Exception vector       0x10#
Program state register
0x20000013
0x002ef7ac
0x002f0390
0x002f08d8
0x002f23bc
0x00134684
Nov 13 01:39:27 ciscosw5 %INIT-I-Startup: Cold Startup
Need urgent advise...
Thank you!

Hello!
My name is Robert and I am network engineer for the Cisco SBSC. This is the correct place for the ESW500 series.
From the error messages you are seeing, I would recommend to disable the Bonjour service to see if that helps with the reboots. I am currently looking into the error messages you are getting to see if there is a solution. I would recommend giving us a call as well for immediate assistance on the error messages. Below is a link for our support center numbers.
http://www.cisco.com/en/US/support/tsd_cisco_small_business_support_center_contacts.html

Can we schedule backup of cisco san switch 9148 through windows backup utility.

can we schedule backup of cisco san switch 9148 through windows backup utility.

sure, you can write a batch/perl/powershell/whatever script that will connect to your switch and then backup the configuration. You need to decided where you are going to back it up to, possible options include TFTP, SCP, FTP, SFTP. For example i am backing to a TFTP server, my perl script connect to the switch and runs this command:
copy startup-config tftp://tfpserver-ip/mds9513.$(TIMESTAMP).config
TIMESTAMP is actually a built-in variable that will be replaced with the date/time configured on the switch.

Firmware upgrade question for 300 series switches

Hi-
I have a customer that is investigating a strategy and solution for centralized firmware management of the 300 series switches. They have found an issue in the lab where they were trying to roll back the firmware to a previous version They can not roll back to the previous firmware version, which is desirable in the case of finding an issue in the new firmware that causes them to have need to rollback to a known working version.
We have read in the cisco 300 switch admin guide that there are two images (active and inactive) and that a new downloaded firmware always replaces the inactive image and is active until explicitly set. The admin guide does not mention inability to make an older firmware image as active image when the switch has previously run on a new release firmware image. My customer's engineers testing have informed me that an older image can not be made active after a newer image has booted. Can you please verify if this if a fallback is supposed to work as it is causing a lot of concern-
Thanks-
Jena

Jena,
The release notes -
http://www.cisco.com/en/US/docs/switches/lan/csbms/sf30x_sg30x/release_notes/Sx200-Sx300_R1.1.2.x.pdf
What firmware is the switches currently on?
Major Changes and Defects Corrected
• Hardware version 1.0 devices that were upgraded to software version 1.1
can now be downgraded to software version 1.0. You must delete the
startup configuration file before rebooting the device to software version
1.0. Otherwise the device may have problems when booting up. You may
backup your running configuration before the reboot, and re-import the
configuration afterward. Major Changes and Defects Corrected
• Hardware version 1.0 devices that were upgraded to software version 1.1
can now be downgraded to software version 1.0. You must delete the
startup configuration file before rebooting the device to software version
1.0. Otherwise the device may have problems when booting up. You may
backup your running configuration before the reboot, and re-import the
configuration afterward.
Please read full release notes for other work arounds
Hope this helps,
Jasbryan

CCA for 100 + 300 series switches?

Is it in the roadmap to provide CCA control over 300 series switches? We have a lot of SRW2008's put in before the 8-port ESW existed...and we have PITA vlan consistency issues out there too that I think CCA would help fix.
While I understand the "don't pre-announce products", I need a level of design intent around CCA - is it a tool for configuring UC series pieces primarily and all else is secondary? Or is it the multi-device config tool for all SBCS pieces?

Nothing to do with the UC - primary concern is standalone networks.
Real life case:
2 ESW switches in control room hooked up to SA540
Closet switches are SRW2008's
Port no more than two devices are supposed to go now has 4, add an SRW2008 to the desk location.
Now, it turns out that there is a badly behaved device at the desk - a video player that spews all sorts of traffic when it's playing that doesn't play nice with others. So I now need to set-up a VLAN crossing those two switches. Oh, and it turns out the customer decided to unplug an access point and plug it into that switch too which ended up causing a loop when the PC plugged into ethernet someplace else attached to the PC.
Tasks:
Ensure that the 2 SRW2008's have proper vlan assignments to setup a port vlan for that video server.
Issues:
Make sure you assign proper configs to both ends of each link
Make sure not to confuse one SRW2008 with another
If new vlan, make sure all other ports that need to see it can still see it.
Applications for CCA:
Visualize all VLANS
Document port assignments (i.e. where is the video server vs. printer on that last leg 2008)
More easily see port statistics across multiple switches
So after I did that work, I realized that the SA540 wasn't really up to being an aggregation switch too and made the ESW-540-48 into the aggregation switch which required some more changes - however CCA made it easy...
At another job, I have SA540 + AP541ns (upgraded from RVL200 + WAP54GP's) but if I had 300 series in CCA, I'd upgrade the SRW2024's and SRW2008's but without easy management tools, the labor cost will be too high to make their networks really managed.....CCA makes that layer of management cheaper.

How to remove the WiSM2 from the Catalyst 6500 series switch?

Hello, can you explain to me how to safely remove the WiSM2 from the Catalyst 6500 series switch?
According to the documentation "Catalyst 6500 Series Wireless Services Module 2 Installation and Verification Note":
To remove the WiSM2, perform these steps:
Step1     Shut down the module by one of these methods:
In privileged mode from the router prompt, enter the hw-mod module mod shutdown command. NoteIf you enter this command to shut down the module, you must enter the following commands in global configuration mode to restart (power down, and then power up) the module:
Router# no power enable module modRouter# power enable module mod
If the module does not respond to any commands, press the SHUTDOWN button located on the front panel of the module.
Step2     Verify that the WiSM2 shuts down. Do not remove the module from the switch until the POWER LEDis off.
But, in the case of Step1 (1st methods) I do not see a option "shutdown" in the command "hw-mod module 3"...
All I prompted to enter is:
c6500#hw-module module 3 ?
boot           Specify boot options for the module through Power Management Bus control register
reset          Reset specified component
simulate Simulate options for the module
Is it hidden options? IOS version of c6500 is 12.2(33)SXJ1
In the case of Step2 (2nd methods) there is not any button on the front panel of the module?
And yet, it is better to remove the module configuration manually or use the command module clear-config prior to removing the module?

Good catch.
Which one is true, will get back to you on this if i've something soon.
http://www.cisco.com/en/US/docs/wireless/module/wism2/installation/note/WiSM_2.html#wp34727
The above link is procedure to remove wism2. This procedure doesn’t look like wism2 is hot swapable.
http://www.cisco.com/en/US/docs/wireless/module/wism2/installation/note/WiSM_2.html#wp34621
All modules, including the supervisor engine (if you have redundant supervisor engines), support hot swapping. You can add, replace, or remove modules without interrupting the system power or causing other software or interfaces to shut down. For more information about hot-swapping modules, see the Catalyst 6500 Series Switch Module Installation Guide.

Need rack ears for SR224 series switch. Please help.

I need a pair of rack ears for an SR224 series switch. (11-inch wide chassis)
Please direct me to a part-number and a source.
Thank you!

You have posted exactly the same question on the WAN Routing and Switching forum where it has already gotten some response. I suggest that we consolidate any discussion to that forum.
HTH
Rick

I need online Configuration Guide for Catalyst Express 500 Series Switches

Hi Mates,
Please is there an online help page for 500 series catalyst
I have this one for IOS 12.2(25)FY http://www.cisco.com/en/US/products/ps6545/products_configuration_example09186a00806da6c9.shtml
but I need more detailes like IOS 12.3(7)JA for Aironet 1300 http://www.cisco.com/en/US/products/ps5861/products_configuration_guide_book09186a00804ebd50.html
Regards
Saher

I'm afraid there is not such document for IOS 12.2(25)FY since the Catalyst Express 500 Series switches are manageable through the GUI Device Manager or Cisco Network Assistant.
I have also found key features and standards supported for that release:
http://www.cisco.com/en/US/products/sw/iosswrel/ps5012/prod_bulletin0900aecd8033b8b3.html
Hope this helps

Ask the Expert: Cisco Nexus 2000, 5000, and 6000 Series Switches

with Cisco Expert Vinayak Sudame
Welcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to learn and ask questions how to configure and troubleshoot the Cisco Nexus 2000, 5000 and 6000 Series Switches with Cisco subject matter expert Vinayak Sudame. You can ask any question on configuration, troubleshooting, features, design and Fiber Channel over Ethernet (FCoE).
Vinayak Sudame is a Technical Lead in Data Center Switching Support Team within Cisco's Technical Services in RTP, North Carolina. His current responsibilities include but are not limited to Troubleshooting Technical support problems and Escalations in the areas of Nexus 5000, Nexus 2000, FCoE. Vinayak is also involved in developing technical content for Cisco Internal as well as external. eg, Nexus 5000 Troubleshooting Guide (CCO), Nexus 5000 portal (partners), etc. This involves cross team collaboration and working with multiple different teams within Cisco. Vinayak has also contributed to training account teams and partners in CAE (Customer Assurance Engineering) bootcamp dealing with Nexus 5000 technologies. In the past, Vinayak's responsibilities included supporting MDS platform (Fiber Channel Technologies) and work with EMC support on Escalated MDS cases. Vinayak was the Subject Matter Expert for Santap Technologies before moving to Nexus 5000 support. Vinayak holds a Masters in Electrical Engineering with Specialization in Networking from Wichita State University, Kansas. He also holds Cisco Certification CCIE (#20672) in Routing and Switching.
Remember to use the rating system to let Vinayak know if you have received an adequate response.
Vinayak might not be able to answer each question due to the volume expected during this event. Remember that you can continue the conversation on the Data Center sub-community, Other Data Center Topics discussion forum shortly after the event.
This event last through Friday July 12, 2013. Visit the community often to view responses to youe questions of other community members.

Hi Vinayak,
Output of "show cfs internal ethernet-peer database"
Switch 1
ETH Fabric
Switch WWN logical-if_index
20:00:54:7f:ee:b7:c2:80 [Local]
20:00:54:7f:ee:b6:3f:80 16000005
Total number of entries = 2
Switch 2
ETH Fabric
Switch WWN logical-if_index
20:00:54:7f:ee:b6:3f:80 [Local]
20:00:54:7f:ee:b7:c2:80 16000005
Total number of entries = 2
Output of "show system internal csm info trace"
Switch 1 in which "show cfs peers" show proper output
Mon Jul 1 05:46:19.145339 (CSM_T) csm_sp_buf_cmd_tbl_expand_range(8604): No range command in buf_cmd_tbl.
Mon Jul 1 05:46:19.145280 (CSM_T) csm_set_sync_status(6257): Peer RT status PSSed
Mon Jul 1 05:46:19.145188 (CSM_T) csm_sp_handle_local_verify_commit(4291):
Mon Jul 1 05:46:19.145131 csm_continue_verify_ac[597]: peer is not reachable over CFS so continuing with local verify/commit
Mon Jul 1 05:46:19.145071 csm_tl_lock(766): Peer information not found for IP address: '172.16.1.54'
Mon Jul 1 05:46:19.145011 csm_tl_lock(737):
Mon Jul 1 05:46:19.144955 (CSM_EV) csm_sp_build_tl_lock_req_n_send(941): sending lock-request for CONF_SYNC_TL_SESSION_TYPE_VERIFY subtype 0 to Peer ip = (172.16.1.54)
Mon Jul 1 05:46:19.143819 (CSM_T) csm_copy_image_and_internal_versions(788): sw_img_ver: 5.2(1)N1(2a), int_rev: 1
Mon Jul 1 05:46:19.143761 (CSM_T) csm_sp_get_peer_sync_rev(329): found the peer with address=172.16.1.54 and sync_rev=78
Mon Jul 1 05:46:19.143699 (CSM_T) csm_sp_get_peer_sync_rev(315):
Mon Jul 1 05:46:19.143641 (CSM_EV) csm_sp_build_tl_lock_req_n_send(838): Entered fn
Mon Jul 1 05:46:19.143582 (CSM_T) csm_set_sync_status(6257): Peer RT status PSSed
Switch 2 in which "show cfs peers" does not show proper output
Mon Jul 1 06:13:11.885354 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport mode trunk, cmd pseq 77 seq 482
Mon Jul 1 06:13:11.884992 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd channel-group 51 mode active, cmd pseq 357 seq 369
Mon Jul 1 06:13:11.884932 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport trunk allowed vlan 2, 11, cmd pseq 357 seq 368
Mon Jul 1 06:13:11.884872 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport mode trunk, cmd pseq 357 seq 367
Mon Jul 1 06:13:11.884811 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd description process_vpc, cmd pseq 357 seq 366
Mon Jul 1 06:13:11.884750 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd channel-group 51 mode active, cmd pseq 352 seq 365
Mon Jul 1 06:13:11.884690 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport trunk allowed vlan 2, 11, cmd pseq 352 seq 364
Mon Jul 1 06:13:11.884630 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd switchport mode trunk, cmd pseq 352 seq 363
Mon Jul 1 06:13:11.884568 (CSM_ERR) csm_pss_cmd_tree_walk_cb(2057): Parent command not found for cmd description process_vpc, cmd pseq 352 seq 362
Mon Jul 1 06:13:11.884207 (CSM_EV) csm_sp_acfg_gen_handler(3011): Preparing config into /tmp/csm_sp_acfg_1733916569.txt
Mon Jul 1 06:13:11.878695 csm_get_locked_ssn_ctxt[539]: Lock not yet taken.
Mon Jul 1 06:13:11.878638 (CSM_EV) csm_sp_acfg_gen_handler(2937): Recieved sp acfg merge request for type: running cfg
Mon Jul 1 06:12:29.527840 (CSM_T) csm_pss_del_seq_tbl(1989): Freeing seq tbl data
Mon Jul 1 06:12:29.513255 (CSM_T) csm_sp_acfg_gen_handler(3106): Done acfg file write
Mon Jul 1 06:12:29.513179 (CSM_EV) csm_sp_acfg_gen_handler(3011): Preparing config into /tmp/csm_sp_acfg_1733911262.txt
Mon Jul 1 06:12:29.508859 csm_get_locked_ssn_ctxt[539]: Lock not yet taken.
Mon Jul 1 06:12:29.508803 (CSM_EV) csm_sp_acfg_gen_handler(2937): Recieved sp acfg merge request for type: running cfg
Mon Jul 1 05:53:17.651236 Collecting peer info
Mon Jul 1 05:53:17.651181 Failed to get the argumentvalue for 'ip-address'
Mon Jul 1 05:40:59.262736 DB Unlocked Successfully
Mon Jul 1 05:40:59.262654 Unlocking DB, Lock Owner Details:Client:1 ID:1
Mon Jul 1 05:40:59.262570 (CSM_T) csm_sp_del_buf_cmd(1713): Deleting comand with Id = 1
Mon Jul 1 05:40:59.262513 DB Lock Successful by Client:1 ID:1
Mon Jul 1 05:40:59.262435 Recieved lock request by Client:1 ID:1
Mon Jul 1 05:40:41.741224 ssnmgr_ssn_handle_create_get: Session FSM already present, ID:1
Mon Jul 1 05:40:41.741167 ssnmgr_handle_mgmt_request: Create/Get request received for session[process_n5kprof]
show cfs lock gives no output.
Just to further clarify, we have 4 5548UP switches in the same management vlan. 2 switches are in one location lets say location A and they are CFS peers and are working fine.
These two switches which are having problem are in location B. All the switches are in the same vlan. Essentially the all CFS multicast messages will be seen by all 5548 switches as they are in the same vlan. I am assuming that this might not create any problems as we specify the peers in the respective configurations. Or do we have to change the CFSoIPv4 multicast addresses in location B or may be configure a different region.
Regards.

APs unable to receive IP address from DHCP (core 6500 series switch)

Dear Friends,
a week ago I had stable wireless network APs were getting IPS from 6500 series switch (DHCP) but unfortunately some WISM got rebooted and now APs are unable to receive IP address from Core 6500 DHCP, to cater this issue I have another DHCP server configured on windows 2008 i created another subnet and and put APs in that vlan now all APs are are successfully receiving IPS from windows DHCP server I don't know why APs are not able to receive IPs from core 6500 series DHCP.
please advice
Thanks
Faysal

Thanks george for stepping up here is DHCP config
ip dhcp excluded-address 10.10.30.1 10.10.30.20
ip dhcp excluded-address 10.10.8.1 10.10.8.10
ip dhcp excluded-address 192.168.10.1 192.168.10.5
ip dhcp excluded-address 10.9.20.1 10.9.20.30
ip dhcp pool vlan_30
network 10.10.30.0 255.255.254.0
default-router 10.10.30.1
option 60 ascii """"""""""""""""""""""""CiscoAPc1250""""""""""""""""""""""""
option 43 hex f110.0a0a.1e0b.0a0a.1e0d.0a0a.1e0f.0a0a.1e11
dns-server 10.10.2.11
lease infinite
ip dhcp pool WiSM1_SP
network 192.168.10.0 255.255.255.248
default-router 192.168.10.1

Ask the Expert: Different Flavors and Design with vPC on Cisco Nexus 5000 Series Switches

Welcome to the Cisco® Support Community Ask the Expert conversation. This is an opportunity to learn and ask questions about Cisco® NX-OS.
The biggest limitation to a classic port channel communication is that the port channel operates only between two devices. To overcome this limitation, Cisco NX-OS has a technology called virtual port channel (vPC). A pair of switches acting as a vPC peer endpoint looks like a single logical entity to port channel attached devices. The two devices that act as the logical port channel endpoint are actually two separate devices. This setup has the benefits of hardware redundancy combined with the benefits offered by a port channel, for example, loop management.
vPC technology is the main factor for success of Cisco Nexus® data center switches such as the Cisco Nexus 5000 Series, Nexus 7000 Series, and Nexus 2000 Series Switches.
This event is focused on discussing all possible types of vPC along-with best practices, failure scenarios, Cisco Technical Assistance Center (TAC) recommendations and troubleshooting
Vishal Mehta is a customer support engineer for the Cisco Data Center Server Virtualization Technical Assistance Center (TAC) team based in San Jose, California. He has been working in TAC for the past 3 years with a primary focus on data center technologies, such as the Cisco Nexus 5000 Series Switches, Cisco Unified Computing System™ (Cisco UCS®), Cisco Nexus 1000V Switch, and virtualization. He presented at Cisco Live in Orlando 2013 and will present at Cisco Live Milan 2014 (BRKCOM-3003, BRKDCT-3444, and LABDCT-2333). He holds a master’s degree from Rutgers University in electrical and computer engineering and has CCIE® certification (number 37139) in routing and switching, and service provider.
Nimit Pathak is a customer support engineer for the Cisco Data Center Server Virtualization TAC team based in San Jose, California, with primary focus on data center technologies, such as Cisco UCS, the Cisco Nexus 1000v Switch, and virtualization. Nimit holds a master's degree in electrical engineering from Bridgeport University, has CCNA® and CCNP® Nimit is also working on a Cisco data center CCIE® certification While also pursuing an MBA degree from Santa Clara University.
Remember to use the rating system to let Vishal and Nimit know if you have received an adequate response.
Because of the volume expected during this event, Vishal and Nimit might not be able to answer every question. Remember that you can continue the conversation in the Network Infrastructure Community, under the subcommunity LAN, Switching & Routing, shortly after the event. This event lasts through August 29, 2014. Visit this forum often to view responses to your questions and the questions of other Cisco Support Community members.

Hello Gustavo
Please see my responses to your questions:
Yes almost all routing protocols use Multicast to establish adjacencies. We are dealing with two different type of traffic –Control Plane and Data Plane.
Control Plane: To establish Routing adjacency, the first packet (hello) is punted to CPU. So in the case of triangle routed VPC topology as specified on the Operations Guide Link, multicast for routing adjacencies will work. The hellos packets will be exchanged across all 3 routers and adjacency will be formed over VPC links
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/operations/n5k_L3_w_vpc_5500platform.html#wp999181
Now for Data Plane we have two types of traffic – Unicast and Multicast.
The Unicast traffic will not have any forwarding issues, but because the Layer 3 ECMP and port channel run independent hash calculations there is a possibility that when the Layer 3 ECMP chooses N5k-1 as the Layer 3 next hop for a destination address while the port channel hashing chooses the physical link toward N5k-2. In this scenario,N5k-2 receives packets from R with the N5k-1 MAC as the destination MAC.
Sending traffic over the peer-link to the correct gateway is acceptable for data forwarding, but it is suboptimal because it makes traffic cross the peer link when the traffic could be routed directly.
For that topology, Multicast Traffic might have complete traffic loss due to the fact that when a PIM router is connected to Cisco Nexus 5500 Platform switches in a vPC topology, the PIM join messages are received only by one switch. The multicast data might be received by the other switch.
The Loop avoidance works little different across Nexus 5000 and Nexus 7000.
Similarity: For both products, loop avoidance is possible due to VSL bit
The VSL bit is set in the DBUS header internal to the Nexus.
It is not something that is set in the ethernet packet that can be identified. The VSL bit is set on the port asic for the port used for the vPC peer link, so if you have Nexus A and Nexus B configured for vPC and a packet leaves Nexus A towards Nexus B, Nexus B will set the VSL bit on the ingress port ASIC. This is not something that would traverse the peer link.
This mechanism is used for loop prevention within the chassis.
The idea being that if the port came in the peer link from the vPC peer, the system makes the assumption that the vPC peer would have forwarded this packet out the vPC-enabled port-channels towards the end device, so the egress vpc interface's port-asic will filter the packet on egress.
Differences: In Nexus 5000 when it has to do L3-to-L2 lookup for forwarding traffic, the VSL bit is cleared and so the traffic is not dropped as compared to Nexus 7000 and Nexus 3000.
It still does loop prevention but the L3-to-L2 lookup is different in Nexus 5000 and Nexus 7000.
For more details please see below presentation:
https://supportforums.cisco.com/sites/default/files/session_14-_nexus.pdf
DCI Scenario: If 2 pairs are of Nexus 5000 then separation of L3/L2 links is not needed.
But in most scenarios I have seen pair of Nexus 5000 with pair of Nexus 7000 over DCI or 2 pairs of Nexus 7000 over DCI. If Nexus 7000 are used then L3 and L2 links are required for sure as mentioned on above presentation link.
Let us know if you have further questions.
Thanks,
Vishal

Best command for script backup?

hello,
i always use robocopy for file backup , but with powershell and the new technologies is still the easiest and best choice?

Your initial question was "Best command for script backup?". For this you received an answer. If you now need support on the subject of your script then you should start a new thread. Note also that you must test your robocopy command from a
command line before trying to embed it in a PowerShell script.

Scripted backup of ESW series switches

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