Cisco Switching/Routing :: IPv6 DHCP Preferred Lifetime (Cat3750X)
Feb 18, 2013
There are two kinds of time for assinging IPv6 address from DHCP server.Actaully Catalyst 3750X can do this role. however I am not sure about the difference between Valid lifetime and preferred lifetime.In my understanding the valide lifetime is total lifetime for using the assigned IPv6 address but the prefered lifetime when the assinged IPv6 address is expired at the prefered lifetime then the device may generate extended request or something right?
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Jan 25, 2013
I've got a recurring them developing across several deployments of Catalyst 3750X series switches, I'm seeing large amount of output drops across multiple ports but there are is no QoS deployed on any of these switches. (standard FiFO). As it happens the ports in question are a member of EtherChannel groups which are connected to ESX Hosts.I've also seen this behaviour also unexplained on another 3750X at a different site, however it's a single port and connects to an Upstream firewall.However in both cases neither switch has any QoS or non-standard configuration, literally a couple of VLAN's and some EtherChannel groups.Here's some output from the case involving the ESX servers.
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Jul 4, 2012
I've got a recurring them developing across several deployments of Catalyst 3750X series switches, I'm seeing large amount of output drops accross multiple ports but there are is no QoS deployed on any of these switches. (standard FiFO).
As it happens the ports in question are a member of EtherChannel groups which are connected to ESX Hosts.I've also seen this behaviour also unexplained on another 3750X at a different site, however it's a single port and connects to an Upstream firewall.
However in both cases neither switch has any QoS or non-standard configuration, literally a couple of VLAN's and some EtherChannel groups.Here's some output from the case involving the ESX servers:
Port-channel6 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 1cdf.0f82.1607 (bia 1cdf.0f82.1607)
Description: EC to xxxx
MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
[Code]...
How I can attempt to identify what traffic is being dropped?
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Dec 15, 2011
I have a situation where a specific unit on my network is booting using BOOTP.The unit is connected to a stack of two Cat3750X switches running IOS 12.2(55)SE1. The server and client is on the same VLAN on the same physical switch, so it is purely L2 between the server and client. The BOOTP server is a computer running a specific software connected to the switch. There is no DHCP server on the switch. IP-helper is not configured on the switch.
If I do a monitor-session on the client port I can see the BOOTP request packet enter the switch, however this packet is never flooded out of any ports in the switch, so the BOOTP server never receives the request. I have tested the server and client in a cheap dumb switch and there it is working just fine. Regular DHCP requests are flooded correctly.It apprs the there is something in the clients BOOTP request that is not correct, since the Cisco switch apparently discards the packet.
Are there any BOOTP gurus that can have a look on the attached (Wireshark) BOOTP client request and perhaps determine if it is infact malformed? Why the switch is not flooding the packet. What is the meaning of the BOOTP broadcast flag in a client boot request?
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Nov 11, 2012
I have some DHCP trouble since I subnetted my network with a 2921. My clinets are in 172.16.2.0/23 and DHCP servers are in 172.16.5.0/24.Sometimes, randomly I guess, I get NACK from my DHCP server, and if I look into DHCP logs I got something like this:
15,11/09/12,09:52:27,NACK,172.16.3.172,switchE51D12.host.com,A0CF5BE51D12,,0,6,,,,,,,,
15,11/09/12,09:52:28,NACK,172.16.3.172,switchE51D12.host.com,A0CF5BE51D12,,0,6,,,,,,,,
15,11/09/12,09:52:29,NACK,172.16.3.172,switchE51D12.host.com,A0CF5BE51D12,,0,6,,,,,,,,
[code]....
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Apr 3, 2012
Have a client wanting to hand out public ip addresses to all clients from a PFSense Firewall terminating the internet connection.
How do I allow the Cisco Switches currently in place, configured with private ip addresses in the 10.10.x.x ranges and Vlans, where the main 3550 layer 3 has defined dhcp scopes for each vlan, to relay dhcp requests from all vlans to the PFSense firewall?
I assume I would take off the currently defined dhcp scopes for the vlans and configure each vlan/switch with the ip helper address and specify the PFSense firewall and that Nat would have to be disabled onthe firewall?
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May 20, 2013
I have a very basic setup here but strange the router is learning RIP routes advertised by the switch but the switch is learning anyRIP routes. Debug shows the switch is sending updates but not receiving any. There is also these error: %MRIB_API-3-ASYNC_ERR: Asynchronous error: failed to register to the MRIB. errno 0xE
I can ping across the gig 0/2 (switch) and GIg 0/2/0 (router)
sw01 - ME 3600
rtr1 - ASR 1001
sw01 config
[Code]......
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Nov 11, 2012
I'm looking to try and implement ipv6 HSRP on a series of IOS-XR Routers running 4.2.1 following on from successfully setting up IPv6 HSRP on a few cat6509s on VLAN Interfaces in other parts of the network. I have entered the "router hsrp" configuration menu and gone into the interface in question that I'm looking to setup with IPv6 HSRP. Unfortunately, there version 2 or address-family ipv6 commands are not available.
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Mar 18, 2012
I use IOS Software, ME360x Software (ME360x-UNIVERSALK9-M), Version 12.2(52)EY2. I not found the command "ipv6" on global and interface configuration.
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Nov 28, 2012
I need to know the 172cisco 1 router support to IPv6 & it support to IPv6 then which IOS is required for it.Also I need to know the cisco 2960 switch is support to IPv6?
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Aug 8, 2012
Just I have upgraded some 2960S to IOS 15.0(2)SE from a IOS 15.0(1)SE3 and the catalyst don't switch any IPv6 traffic. Don't work any RA and also don't work any unicast IPv6 traffic from any interface. I can see some references to IPv6 changes in the FHS (First Hop Security) in the Release Notes, but no any reference to changes in the configuration.
The switches don't have any IPv6 specific configuration and the sdm is the default templata. Returning to 15.0(1)SE3 everything work ok.
On Catalyst 2960, and 3560E this IOS version seem to work fine with IPv6.
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Dec 13, 2011
I've a 3750-48ps-s running ios version: c3750-advipservicesk9-mz.122-46.SE.bin
I've tried to configure ipv6 on an interface but it does not give me the option.
How do I know if my ios is IPv6 capable?
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Mar 2, 2013
I have cisco 2960 and Catlyst 4510 switches now we are planning to implement IPV6.
i have the fallowing IOS on my switches.
C2960-lanbasek9-mz.122-50.se5
Cat4500e-entservicesk9-mz.122-54.sg1.bin
The above ios will support for IPV6 or I have to purchase new IOS, which version will support.
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Jan 3, 2012
Trying to control capacity utilization for guest users connecting to a 2960 switch. No problem for IPv4 users, but IPv6 is giving me fits. What I've found out by trial and error so far implies that there is just enough IPv6 smarts in a WS-C2960-24TT-L running c2960-lanbasek9-mz.150-1.SE to make it impossible to control IPv6 traffic. Blocking IPv6 would be sufficient short term, but MAC filtering on type 0x86DD does not appear to work either. Here are the results I've gotten so far:
What "works":
* Protocol ipv6 or an IPv6 ACL in a class map.
* Using a class map referencing ipv6 protocol or an ipv6 ACL in a policy map.
* IPv4 inbound filters and policing.
* Blocking of IPv4 traffic by a MAC ACL blocking type 0x0800 (IPv4) - note that the docs explicitly state that MAC filters do NOT filter IP traffic, except for on this box on this release they do.
What does not work:
* Applying a policy map referencing a class map referencing protocol ipv6 or an IPv6 ACL to an interface. The service policy is accepted by the parser, but is not inserted into the running configuration.
* "class-default" in a policy map only matches IPv4 traffic, not all other traffic.
* Blocking of IPv6 traffic by a MAC ACL blocking type 0X86DD. No problem applying the access-group to the interface, it just doesn't do anything.
I am aware that this box is not supposed to support IPv6 other than for multicast, but as implemented, this is a hole an abuser could drive a MAC truck through.
My questions:
Is this situation unique to this particular 2960 switch or SW release (I also tried 12.2(58)SE2) or does it afflict all 2960's running LANbase?
Assuming the answers to the first two question are negative, what is the minimum requirement to get working IPv6 policing in an edge switch?
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Aug 30, 2012
I've several production Catalyst switches that are listening on the same IPv4 and IPv6 ports. The problem is I don't want the switches listening on the IPv6 ports.[code] How to shut down these listening ports?I also have a few production switches listening on UDP/10000 and I cannot determine why this port is listening. [code] I've seen where UDP/10000 is Network Data Management Protocol and is related to Storage networks ###, but I've also seen where UDP/10000 is the default port for IPSEC data.I don't believe UDP/10000 is related to either NDMP or IPSEC data, though I could be very wrong.
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May 23, 2012
I have seen other discussions regarding Static MAC address entries on IPv4, but what of IPv6?We have MS NLB solutions and they are working fine. We have Cisco 6509/6504, Version 12.2(33)SXI5
But then we have a new one for a new ActiveDirectory solution, and on those networks we have implemented IPv6.
How is Static MAC address entries and MS NLB solved in IPv6 (i.e arp ip.ip.ip.ip mac.mac.mac ARPA gi1/1). I can't seem to find much examples or documentation on this? Is it replaced with another function?The reason I ask is twofold.
1. I really want to know
2. The NLB cluster seem to drop IPv6 traffic at even intervals, witch seems to correspond with NLB transition.
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Feb 18, 2013
I am having WS-C3560G-48TS switch with ios(c3560-ipbasek9-mz.122-58.E2.bin) and I am trying to use IPv6 feature in this switch model. More over I've upgraded this switch with many ios but none of them not supporting IPv6 feature. ios which supports IPv6 feature?
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Nov 3, 2012
Need to confirm if WS-C3750-48TS-S supports Private vlans and IPV6?
Also need to know which stack cable like part number i can use for stacking them .
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Jun 25, 2012
I have the cisco 3640 with IOS Version 12.2(46) , and it with DRAM:32M , Flash:8M.What IOS version can support IPv6 RIP in the hardware limit?
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Feb 3, 2011
I am struggling turning on DHCP client prefix delegation on a dial 0 interface on at 1941w.
Everything can be configured apart from prefix delegation features. The following command is just are missing.
int dial 0
ipv6 dhcp client pb
I have configured this on a 877 router with no problems. I have tried 15.0(1)M3 and 15.1(3)T.
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Jan 9, 2013
I haven't understood the lifetime field in RA of vrrp3, need some light on it. Can any give the format of an RA from master?
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May 28, 2013
We've got a central office (actually quite small) where several IPSec connections connect to. Two of these connections are Cisco 881 routers. One of them works fine, the other craps out after 24 hours (coincidentally also the IKE key lifetime). When I mean "craps out", it means the VPN worked fine from the get go, until 24 hours later. Only a reload will bring back the VPN tunnel. I've verified my PFS and DPD configurations are solid, because these kind of symptoms would most likely occur when these configurations aren't in order.
The two 881 configurations are quite similar. The only differences between the two are some details in the PPPoE configurations and (quite obviously) the IP address space for the two sites. Both operate on the premise of a point to point connection (no multipoint stuff going on here).
[code]....
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Jun 9, 2012
When I enable IPv6 on my E4200, the Windows 7 DHCP client crashes. It also seems to crash the audio service, the event logger and a few other windows services.
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Jun 6, 2013
We currently have ACS 5.4 and Cisco WLC 5508's deployed. We have wireless lobby admin accounts that can login and successfully create and modify guest wireless accounts. What we are trying to do, however, is give the lobby admins the ability to create wireless accounts with lifetimes longer than 30 days. Currently our setup will only allow the creation of permanent accounts (by entering all 0's in the lifetime fields) or accounts that last up to thirty days.
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Jul 26, 2011
I am trying to use Ciscoworks LMS3.2 with RME 4.3.1. to upgrade many, many Cat3750x stacks we have laying around. The problem I am having is that Ciscoworks downloads the new image to the Stack’s master switch only and not to all switches. When I reload the stack after the download, any switch could become the master. I already set up the priority to always have the same master, but the process is unreliable and more than once I ended up with another switch as a master. In any case if the master is not the switch with the new image, the stack will keep the old image as their running image and the switch with the newer image has problems joining the stack (after a while it downgrades and become stable)I know how to do it manually, but I was hoping Ciscoworks would be able to do this for me. It would make my life much easier.
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Nov 19, 2011
I HAVE a problem switching the network settings of the TAXCO VX 8 cellphone model.. everytime i changed the settings, it will prompt, "unfinished"
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Nov 26, 2011
I want to secure my routers & switches using ACS server (win server 2003 platform)i prefer Radius how to set it up lets say my ACS server ip addy 192.168.100.100 & key cisco both how to set up ACS for the router/switch & commands for router/switch ALSO, i wanna keep open a back door. if some ACS server is down, i want, ppl can log into router/switch using SSH (local user/pass) but only when ACS is down?
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Jul 6, 2011
in a week or two we are going to put in a secondary internet connection. Is there a way on a pix 515E to have one internet provider be preferred over the other and if the primary fails then the secondary will take over?
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Mar 12, 2013
I have this Cisco 1941 router with two Ethernet ports g0/0 and g0/1. The g0/0 is connected to office LAN with internet access. As my office LAN is DHCP, it will assigned a IP address for g0/0 since this g0/0 is configured as "ip address dhcp". Now my question is that i have a group of 5 pcs, namely PC1, PC2, PC3, PC4 and PC5 that is connected to the switch and one of the ports of this switch is connected to g0/1 of Cisco 1941. Is it possible that let say PC2 and PC3 (both DHCP enabled) could access the internet access from g0/0 and at the same time, the office LAN assigned IP address for PC2 and PC3 automatically?
Office Lan with internet access (DHCP) (Default gateway 10.0.0.1)
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g0/0 (DHCP enable) (DHCP assigned IP address 10.0.0.138)
Cisco router 1941
g0/1
|
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HP Switch
|
PC1 PC2 PC3 PC4 PC5
Is this operation possible? if possible, how to configure inside the router 1941 to achieve this objective?
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Aug 10, 2011
I disconnected and reconnected the powercable while holding on to the setup button until system, alert, setup go amber. The system led light began blinking green. I waited until one of the leds lights on the ports starts blinking green I then connected the ethernet cable connected to my pc. I made sure my lan connection on my computer was set to dhcp.In the docs claim it should take about 1 minute to grab a new ip address. After a few minutes i check the ipconfig on my pc and I get the apipa address.The setup light on the switch remains green while system is amber. The led for port 1 stopped blinking and remains green.My pc is not grabbing an ip address I don't know what else to do.
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Nov 30, 2011
We are looking to avoid the need to install an additional device in our network as our core 6509s are not being pushed by any stretch. However, we are having an issue getting the 6509 to assign DHCP addresses and perform NAT.
Most interfaces and V LAN's on the 6509 are using public IPs and have BGP routing at the edge. We have a trunk up link coming into the 6509 on a ws-6816 card via a SMF GBIC in slot 9, port 2 that feeds a wifi link where we are looking to provide guest access to our network.
We created 2 V LAN s on the switch 20 and 21. We assigned a private IP and network to the VLAN20 interface and assigned a new public /30 sub net ip to the V LAN 21 interface. The following configuration was applied which I thought was the required configuration based on how we would typically configure ISR routers for the same services...
ip dhcp excluded-address 10.200.200.1
!
ip dhcp pool WiFi_Pool
network 10.200.200.0 255.255.255.0
default-router 10.200.200.1
dns-server 4.2.2.1 4.2.2.2
[ code]...
What am I missing in this configuration? Note that if I create an access switch port for v LAN 20 on the switch and plug a laptop in directly to the 6509, the laptop is unable to receive a DHCP address. If I assign the laptop an address in the 10.200.200.0 /24 range manually, I can ping 10.200.200.1 from the laptop, however, the laptop will not get to the internet as it appears to be failing to perform nat.
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May 12, 2013
I am a newbie to Cisco. I am trying to setup NAT with DHCP in our office on CISCO 819 router. I am having a problem with DHCP not assigning an IP on vlan1. I cannot figure out what i'm doing wrong. Below is my config and debug from DHCP.
router#sh config
Using 4328 out of 262136 bytes
!
! Last configuration change at 05:56:39 UTC Mon May 13 2013 by cisco
! NVRAM config last updated at 05:57:16 UTC Mon May 13 2013 by cisco
[Code]....
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Jan 26, 2011
The automatic connection to the preferred network (with a strong signal) does not occur immediately. When I choose it in the list of preferred networks and click on 'connect' (with the password present of course), a message appears stating that the computer is connecting to the network. However, after some time nothing happens and the message terminates. There is no other information given (e.g. 'the computer failed to connect..."). After up to 15 mins or so, the network connects automatically (not sure if this has anything to do with turning the router off and on, restarting the computer, turning the wireless adaptor off and on....)
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