Cisco 28xx: VLANs support
Sirs:
What is the maximum number of VLANs allowed in the in-built FEth interfaces? It depends on IOS version?
Hi,
The 2800 platform will allow you to configure any of the VLAN IDs in the range of 1-4094. The number of actual sub-interfaces that you can create will be limited by the number of Interface Descriptor Blocks (IDB) supported by the platform.
Quoting from CCO: "An Interface Descriptor Block (IDB) is a special control structure internal to the Cisco IOS software that contains information such as the IP address, interface state, and packet statistics. Cisco IOS software maintains one IDB for each interface present on a platform and one IDB for each subinterface."
The number of interfaces that you can have is limited by the IDB limit for the platform and of course, memory available.
Therefore, while you can theoretically configure 4094 ethernet sub-interfaces, in practice that is not achievable.
Now, the 2821 supports a maximum of 1400 software IDBs. So that is what you are limited to.
Pls do remember to rate posts.
Paresh
Similar Messages
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Hi Cisco experts,
My name is Kumagai and I need your expert opinions below.
I am trying to configure one VLAN1 support multiple network segments as below.
(this should be a very straight forward configuration and should be OK, I think ? )
interface Vlan1
ip address 172.30.0.0 255.255.128.0
ip address 172.30.31.253 255.255.254.0 secondary
ip address 172.30.61.253 255.255.254.0 secondary
ip address 172.30.71.253 255.255.254.0 secondary
ip address 172.30.4.253 255.255.255.0 secondary
The only issue that is eating me is the above network segments are using HSRP too
and I am not sure is this possible with a combination of VLAN1 supporting multiples which are
further supported with HSRP settings in Cisco environment.
!example of HSRP:
interface Vlan4
ip address 172.30.4.253 255.255.255.0
no ip redirects
standby 4 ip 172.30.4.254
standby 4 priority 105
standby 4 preempt
<<< what will happen if I add the HSRP configuration as below into the above VLAN1 with multiple Network segment ??)
I would like to summarize my "Combined" configurations as below but I need your expert opinions on
whether the configuration below is workable without any problem ??
Or it is a total flop because Cisco does not support the configuration below !!!
interface Vlan1
ip address 172.30.0.0 255.255.128.0
ip address 172.30.31.253 255.255.254.0 secondary
ip address 172.30.61.253 255.255.254.0 secondary
ip address 172.30.71.253 255.255.254.0 secondary
ip address 172.30.4.253 255.255.255.0 secondary
standby 30 ip 172.30.31.254
standby 30 priority 105
standby 30 preempt
standby 60 ip 172.30.61.254
standby 60 priority 105
standby 60 preempt
standby 70 ip 172.30.71.254
standby 70 priority 105
standby 70 preempt
standby 4 ip 172.30.4.254
standby 4 priority 105
standby 4 preempt
Thanking you in advance !!!!!Hi,
As far as i know we dont set the ip helper address on the radio interface. It should be on the L3 interface of corresposding VLANs i.e.
int vlan 20
ip helper-address 192.168.33.xxx
int vlan 60
ip helper-address 130.20.1.xxx
I'm assuming that your using SVI's (int Vlan 20 and int Vlan 60) rahter than physical interfaces. Also hope you have configured switch port as trunk where this AP is connected.
Modify the AP config as below since you are using data vlan as the native vlan
interface Dot11Radio0.20
encapsulation dot1Q 20 native
interface FastEthernet0.20
encapsulation dot1Q 20 native
Ideally your AP fastethernet configuration should looks like below and not sure how you missed this as this comes by default when you have multiple vlans for multiple ssids.
interface FastEthernet0.20
encapsulation dot1Q 20 native
no ip route-cache
bridge-group 20
no bridge-group 20 source-learning
bridge-group 20 spanning-disabled
interface FastEthernet0.60
encapsulation dot1Q 60
no ip route-cache
bridge-group 60
no bridge-group 60 source-learning
bridge-group 60 spanning-disabled
Hope this helps.
Regards
Najaf -
Cisco 38xx: VLANs support
Sirs:
What is the maximum number of VLANs allowed in the in-built GEth interfaces? It depends on IOS version?Hi,
The 3800s platform will allow you to configure any of the VLAN IDs in the range of 1-4094. The number of actual sub-interfaces that you can create will be limited by the number of Interface Descriptor Blocks (IDB) supported by the platform.
Quoting from CCO: "An Interface Descriptor Block (IDB) is a special control structure internal to the Cisco IOS software that contains information such as the IP address, interface state, and packet statistics. Cisco IOS software maintains one IDB for each interface present on a platform and one IDB for each subinterface."
The number of interfaces that you can have is limited by the IDB limit for the platform and of course, memory available.
Therefore, while you can theoretically configure 4094 ethernet sub-interfaces, in practice that is not achievable.
Now, the 3825 supports a maximum of 1200 software IDBs and the 3845 supports 1400. So that is what you are limited to.
To find out how much your platform supports, issue the 'show idb' command.
Pls do remember to rate posts.
Paresh -
Is Cisco Nexus 5596UP support vlan base Policing and traffic shaping on code NX OS version: 5.1(3)N1(1)
where i couldn't see any police command under the policy mapI have tested this issue on another 5548UP with L3 running the same NX-OS version and get the same problem. Show CDP from the switch is not discovering devices, but the neightbors can see the 5K in question. Reboot sometimes will fix it, but not always. I suspect a problem with the software since that doesn't happen in NX-OS 5.2. The one I am using is
Software
BIOS: version 3.6.0
loader: version N/A
kickstart: version 5.1(3)N2(1)
system: version 5.1(3)N2(1) -
I recently bought an 851 only to find out afterwards that it only supports 1 VLAN when I needed it to support at least 7. The documentation on VLAN support seemed pretty buried.
Does anyone know if there is an easy way to find out how many VLANs each router model supports? I dont' want to make the same mistake again, and I can't seem to find what I'm looking for by combing through the data sheets for each model.
Thanks!
Sorry, I meant to post this in the routing and switching forum and I can't figure out how to delete the thread.Hi
A maximum of four VLANs are supported on the Cisco 870 Series with the plus feature set (Advanced IP Services/Advanced Enterprise Services) Cisco IOS. The Cisco 850 Series only supports one 802.1q VLAN.
See this link http://www.cisco.com/en/US/products/hw/routers/ps380/products_qanda_item0900aecd8028a982.shtml -
hello, i have the cisco router (871) and when i try to create another vlan (another than vlan1 wich is default), i get the following message:
"vlan can not be added. Maximum number of 1 vlan(s) in the database"
with the command "show vtp status" i obtein:
"maximum vlans supported locally:1"
how can i change this???
i have read that i have to update my firmware and add a new flash card, is it true??
thank you very muchi would say try updating the ios image, i have c870-advipservicesk9-mz.124-6.T.bin and i have 8 possible vlans. also check your VTP version and post what it is
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I was looking at the RV016, thinking that it might be perfect for a situation I have, and there seems to be many references in various forums for simpleVLAN support for this model, i.e. designating a range of physical ports to a VLAN. But the documentation on Cisco's site for this model makes no mention of VLAN support at all. Has it been removed from this model for some reason? Was this a feature on the pre-merger Linksys version that is now gone, or is the feature undocumented for some reason?
Hi Daniel,
You need to configure multiple subnets - in order to have 2 IP ranges.
Thann you need to chose different VLANs on 2 ports of RV016 (Port Management > Port Setup) - for example VLAN1 on port1 and VLAN2 on port 2 - thus you will separate the trafic on the 2 ports. You can connect your LAN on port1 and the AP for guest wifi on port2. Both subnets will have access to i-net, but not one to each other.
Regards,
Kremena
*Please rate the Post so other will know when an answer has been found. -
VLAN Support at routers and switches
is there a table with howmany VLANs each of cisco routers and switches can support.
its not always written at the product data sheet.hi
Do find the details for 1800 ISR series router..
802.1Q VLAN
A total of eight VLANs can be configured to segment a network and offer additional security and separation of network traffic.
VLAN Support
802.1Q VLAN supported on all 10/100BASE-T ports
VLAN Configured
8 VLANs
Wireless VLANs
16
7400 series has reached EOL/EOS status hence i couldnt find any datasheet for that model..
regds -
Cisco devices that support Multicast traffic?
Folks,
I am looking for list of Cisco devices that support Multicast traffic. Does anyone know how to get this information?
Thanks,
NageshCisco Feature Navigator
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Is cisco prime infrastructure support / can be run as syslog server?
Dear All,
is cisco prime infrastructure support / can be run as syslog server?
and,
where i can see network topology diagram, using cisco prime infrastructure?
many thanks,
JerriHello. Cisco Prime LMS will be replaced by Cisco Prime Infrastructure in the near future.
In the current release of Cisco Prime Infrastructure you can't use topology diagrams. This feature is in roadmap.
About syslog, you can send syslogs to Cisco Prime Infrastructure, but I don't recommend using it as syslog server. Please see this link for more information https://supportforums.cisco.com/thread/2179520
Please rate if this helps -
Which cisco wireless bridges support point to multipoint
hi all i am really new to wireless. i am looking for information as which cisco wireless bridges support point to multipoint configuration.
i have a cisco 1230G access-point will it support the same .
any help would be great.
regards
sushilThe Cisco 1300's and 1400's support point-to-point and point-to-multipoint. The 1230G can only support point-to-point (i think)
http://www.cisco.com/en/US/products/hw/wireless/ps441/products_qanda_item09186a0080094644.shtml#q20 -
Cisco 1900 switch support vtp version2 and etherchannel or not?
cisco 1900 switch support vtp version2 and etherchannel or not?
Please help and reference.
Thank in advanceHello,
Fast Etherchannel is supported on 1900 switches.
Please refer the below URL for details:
http://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v9x/ee_scg/overview.htm#xtocid72765
I "think" you need to have Enterprise Edition Software. In case if you have a standard version, then you need to purchase the upgrade kit to upgrade to enterprise version.
As far as I know, VTP V2 is not supported on the 1900.
By the way, 1900 swiches are End of Sale and the last date of support is July, 2007.
http://www.cisco.com/en/US/products/hw/switches/ps574/prod_bulletin09186a008009257d.html
I hope it helps.
Regards,
Arul -
Cisco SSH v2 support diffie-hellman-exchange-group-sha1 ?
one of my router are scanned by Foundstone and get an alert :
""The SSH2 protocol specification requires that a SSH2 server support the
diffie-hellman-group1-sha1 key exchange algorithm. This key exchange
algorithm is considered strong, but faces a potential weakness in that the
same prime number is used for all key exchanges."
SO wanna check if cisco SSH2 can support the diffie-hellman-exchange-group-sha1? If yes, which IOS version required? ( have relevent link is appreciate)
thx..
..peter cheungread http://www.cisco.com/en/US/docs/ios/sec_user_services/configuration/guide/sec_secure_shell_v2.html#wp1082528
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Cisco IronPort Customer Support - Alert
Dear Cisco IronPort customers.
As of 2:30PM PST 08/06/2010 the Cisco IronPort Customer Support ticketing system experienced a system problem that may prevent customers from being able to view their open support tickets. If you are encountering a new Cisco IronPort appliance problem or need an update on an existing problem, please call us at (877) 641-IRON or (650) 989-6533.
We hope to have this problem resolved within the hour, and appologize for the inconvenience.
Cisco IronPort Customer Support ManagementUpdate As of 3:32PM PST the Cisco IronPort Customer Support ticketing system problem has been resolved. Customer should be able to view their tickets and ticket updates at this time.
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Cisco Multicast Manager Support for NEXUS
Hi All,
Does Cisco Multicast manager support Nexus devices ?
Please help.No at this time it does not according to the data sheets:
http://www.cisco.com/en/US/partner/prod/collateral/netmgtsw/ps6504/ps6335/ps6337/q_a_c67-527951.html
You can use cisco data center manager for managing Nexus devices:
http://www.cisco.com/en/US/products/ps9369/index.html
Download software:
http://tools.cisco.com/support/downloads/go/Redirect.x?mdfid=281722751
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