Cisco Switching/Routing :: 2821 Bogus Arp Table Contents

Jul 23, 2012

My 2821 router has an arp table with the wrong ip to Mac mappings.  The impact is that I can reach any host in the subnet.   I can reach hosts in the just fine. [code] It is as if the device is answering all arp requests as a proxy arp or something. Clear arp-cache nor clear ip arp on my 2821 have any affect. 

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Cisco WAN :: WS-SUP720-3B - 2 Full BGP Table - Maximum Routing Table?

Jan 16, 2013

In datasheet of  WS-SUP720-3B - link- was said that are only supported around 256K routes (fib?rib?).With this value I can't get 2 full bgp - that is around 850K ..
The supervisor is that control this or just memory ? I said this because I have a 7204-npe-g1 whith 2 fullrouting and 1G of and he are ok..

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Cisco Switching/Routing :: 3560E - HSRP Gateway Failover And Routing Table

Nov 12, 2012

We have two Cisco 3560E layer 3 switches at the core of our network. The switches are configured as an HSRP pair and the clients on our network point to the HSRP address as their default gateway. So if CORE-A dies, then CORE-B will pick up the address and the default route for the clients will continue to be available.We also need to specify a few static routes on the core switch to allow us to get to specific networks. Is there a way to do this so that the routes failover in the same way that the default gateway does?

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Cisco Switching/Routing :: RIPv2 Routers Setting Routing Table For R3

Dec 5, 2012

I started using RIPv2 on Packet Tracer. I got two subnets to connect with two routers. After I completed that, I decided to add a third router. How to setup the Routing Table for atleast R3 ?

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Cisco Switching/Routing :: 2911 With IOS Version Is 15.1 - Routing Table Not Updating

Oct 2, 2012

I am using Cisco 2911 & IOS version is 15.1. My problem is that after some days (e.g. 15-20 days), the routing table suddenly stops updating & then I have to enter the default route again to make it up. I am using Track 1 to track default route here. After primary link goes down, the Track is also going down but after coming the primary link up, the track is not coming up. So, I have to add the default route again to make it up.

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Cisco Switching/Routing :: GNS3 - Stub Router Not Updating Routing Table - EIGRP

Nov 14, 2012

We have small which I'm looking to implement and have built this on GNS3.
We have:
Router A in site 1
Router B in site 2
Router C in site 3
Router A and B are connection via a point to point 100M link and from Router C we have a 2 point to point one of which is 5Mpbs and going to Router A and Router B.
For Router C to reach Router A network it will go via Router B and these are 100M connection. When the link between Router A and B goes down. Router C should update and start using the 5m route.
For some reson, the routes are not updating. I have to do 'clea ip eigrp ne' for the routes to update and if I reload the routers all works well, it seems the problem is intermittent.

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Cisco Switching/Routing :: Filter A Specific Host(s) From OSPF Routing Table On A ASA 5550 (ABR)?

May 22, 2013

I am attempting to filter a specific host(s) from my OSPF routiing table on a ASA 5550 (ABR) using LSA prefix lists.  However, when I look at the other routers in that area, I notice that ALL LSA type-3's are being removed (10 hosts are now missing from the routing table). I have verified the filter is working on the ABR, but I can't figure why ALL hosts/routes that were coming into the area are now being filtered instead of the specific one that I want to filter out.
Here is the config on the ABR:
prefix-list pdm_pl_000 seq 10 permit
router ospf 1
network area 0
network area 10
network area 10

The host is actually coming from Area '3'.  Am I doing something that is removing all type-3 LSA's?

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Cisco Switching/Routing :: 2821 Periodically Stops Routing All Traffic

Oct 3, 2010

We've got a cisco 2821 router which periodically stops routing all traffic. It seems to happen about once every 2 weeks, and I can't find anything that could be causing it. There are no entries in the log and the router stays up and running but requires a restart to begin processing traffic again. We're running 12.4(13r)T11.Any thoughts, or troubleshooting steps to track this down?

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Cisco Switching/Routing :: 2821 Multicast Routing Relay Basic

Mar 12, 2013

I  start configuring Cisco 2821 router for multicast . First short  description and attached sheme explanation. Let we say  I have small  network with 100 users. One router and Cisco switch 3560. Two VLAN’s,  one for data another for multicast. Data from internet works fine but  now I want to connect multicast servers (or source of more multicast  streams) from another subnet. Router have three interfaces.I expect there should be no problems with multicast configuration, but unfortunately it is not like I expect. What I did ?

First step:  enable multicast routing

Second step: on both interfaces (Fe 0/1 and Fe 0/2)  - ip pim sparse-mode

Third step: configure switch that users are connected to access port in VLAN 222 (temporary to see if multicast work)
When  I start VLC on computer nothing happend. If I try to connect computer  on same subnet where is source of multicast streams it works fine.What  I am doing wrong ? Is there anything about routing ? All subnets are  directly connected. RP is not needed if I have one router or ?

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Cisco Switching/Routing :: 2821 Inter-Vlan Routing And IP NAT To ISP?

Jun 25, 2012

I have just bought myself a Cisco 2821 ISR.At present in my home I have a Cisco 2621XM. Fast Ethernet 0/0 is connected to a 3524XL as a trunk to provide my LAN with inter-vlan routing. it works great. Fast Ethernet 0/1 is connected to my ISP's cable modem and uses the command "Ip address dhcp" to get an IP and all other info from my ISP.FA 0/1 is Ip nat outside and the FA 0/0 and all sub interface like 0/0.1 .24 .168 etc all ip nat inside.I get intervlan routing and access to the internet via this router.I have this 2821 to replace the 2621XM as I plan to run CME on it and want gigabit routing on my vlans as at the moment on the 2621 routing between vlans it at half duplex or seems to be.I have configured the 2821 to ip nat outside on  gig 0/0 and ip nat inside on gig 0/1 and all of the sub interfaces (same setup as my 2621 but with gig ethernet)I have no access to the internet at all but I can ping and other domain names from the terminal session when I am connected to the 2821 via the console or telnet/SSH. the gig 0/0 has an IP assigned from my ISP too but no other nodes on the network can ping outside.Am I missing something here? the version of IOS is V 15.
My access list goes someting like
access-list 1 permit
access-list 1 permit
access-list 100 permit ip any
access-list 100 permit ip any
 and so on
I still cannot access the internet.....

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Cisco Switching/Routing :: 6509 Mac Table Held

Feb 6, 2013

On the 6509, with normal 67xx cards installed, where is all the mac table held, is it held on the card itself or on the supervisor? And if I use dcef cards, I gather the MSFC copies the mac table to the DFC ?

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Cisco Switching/Routing :: 1812 - Mac Address Table

Jan 11, 2012

Cisco 1812, Version 12.3(8)YI1..What does "none" mean ?Most of mac adressess in cam has specified interface, but several has none.

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Cisco Switching/Routing :: 2821 - Routing With Public LAN IP

Jun 7, 2012

I have a Cisco 2821 Router. Its ethernet Interface(E1) is connected to an ISP's Gateway.The outside interface IP is 207.x.x.1, The ISP has given 6 public IPs (202.x.x.1- 202.x.x.6) to use in LAN.
I have configured the router`s Internal Interface(E0) with a public IP address. (i.e. 202.x.x.1)
My Internal LAN PCs  are in  a private range of subnet. Now I wanted my PC users to access the Internet while the Routers public IP remains on internal interface.  How can I do the same?

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Cisco Switching/Routing :: 2FE-2W Compatible With 2821?

Dec 6, 2011

I have a 2Fe-2W Card and wanted to find out if it can be picked up and installed on a Cisco 2821? Below is the version
Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9-M), Version 12.4(8a), RELEASE SOFTWARE (fc2)
Technical Support: [URL]
Copyright (c) 1986-2006 by Cisco Systems, Inc.
ROM: System Bootstrap, Version 12.4(1r) [hqluong 1r], RELEASE SOFTWARE (fc1)
System image file is "flash:c2800nm-adventerprisek9-mz.124-8a.bin"

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Cisco Switching/Routing :: 2821 With 16-ESW CEF Low Memory

May 29, 2012

According to my boss every 3 to 4 months he has to restart our 2821 with a 16-esw module installed because of a low memory issue dealing with CEF. Here is the exact error message.

%% Low on memory; try again laterJun  8 11:18:51.777: %FIB-2-FIBDOWN: CEF has been disabled due to a low memory condition. It can be re-enabled by configuring "ip cef [distributed]" Jun  8 11:19:51.823: %FIB-2-FIBDOWN: CEF has been disabled due to a low memory condition. It can be re-enabled by configuring "ip cef [distributed]" %%

Low on memory; try again later
%% Low on memory; try again later
%% Low on memory; try again later

Jun  8 11:20:51.868: %FIB-2-FIBDOWN: CEF has been disabled due to a low memory condition. It can be re-enabled by configuring "ip cef [distributed]" Jun  8 11:21:51.914: %FIB-2-FIBDOWN: CEF has been disabled due to a low memory condition. It can be re-enabled by configuring "ip cef [distributed

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Cisco Switching/Routing :: 2800 / Clear Arp Table Every 5 Seconds?

Feb 19, 2012

I am in need to have the arp table cleared every 5 seconds or so on a 2800 router.  I was wondering how I might be able to accomplish this.

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Cisco Switching/Routing :: 6500 Not Showing Mac Address Table

Apr 8, 2013

we have 6500 cisco switch as a backbone switch in universty. When ı want to look mac addres table , it does no show all mac address.ı mean if ı type ;show mac address-table there are not all mac address.

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Cisco Switching/Routing :: 3750 IP Addresses Are Not Being Released From Table

Feb 21, 2012

we have a 3750 and use dhcp services on the switch.  every so often we run out of ip's even though we have  much less users than the size of the allocated dhcp pool.  I've noticed that the dhcp bind table is full but a ping-sweep only shows very few ip's being assinged and used.  It looks like the IP addresses are not being released from the table even though I have decreased the lease time to 8 hours.

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Cisco Switching/Routing :: 3750 MAC Table Missing For One VLAN

Jan 18, 2012

I have one VLAN on a 3750 where I do not see any MAC addresses even though it is in use.  This is an unrouted VLAN between a WLC on a port- channel /LAG and an access port to an ASA for guest traffic.  When I do a show MAC add I get nothing for VLAN 60 (guest DMZ) but all other VLANs seem to be OK. Spanning tree is not showing TC counters incrementing either. 
I also was told when put a port on this VLAN the laptop did not get a DHCP address form the ASA, but the wireless guest clients are working fine.  I can see the DHCP leases and ARP entries in the ASA and the ASA ARP in the WLC so some traffic is passing fine.  I'm not onsite right now so troubleshooting is all remote which limits some options.

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Cisco Switching/Routing :: Timeout For Mac Address Table In 3750E

Dec 6, 2011

I have 3750E swiches with IOS v. 12.2(55)SE3. Couple servers connect to ths switch, after ping of IP this servers I can see mac addresses in mac address table.
For instance:
sw1#show mac address-table vlan 20
          Mac Address Table
Vlan    Mac Address       Type        Ports(code)
----    -----------       --------    -----
When ip generate traffic to this server this mac address appear in table again on shot time (less than 10 seconds).

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Cisco Switching/Routing :: Interconnect Between 2821 And HP 5412zl?

Jan 27, 2012

I  have a 5412zl 10.215.x.x/16 Most of the connections on this switch are  on vlan1. B9 is the port which is connected to a Cisco 2821 Router. The  port on that end is GE0/1. The port on the cisco side is not a trunk but  configure with an ip of Its part of a some ip  access group. The network that i now sit on is a 172.x.x.x/24 (behind  cisco router, about 3 hops to that main 2821)We current  have a system on my side that talks to a server on the 10.215. that has  no issues. I'm trying to access some switches on the 10.215. and have  had no luck reaching them.
Here is the access list that i found that port is configured to use:

permit ip permit ip permit ip permit ip permit ip permit ip permit ip permit ip I  would think the first permit would allow me to get through to the  10.215 side but maybe i need to set something up on the hp size to let  it know how to get back? I'm very new to this stuff.

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Cisco Switching/Routing :: 2821 Forwarding Udp Broadcast

Jul 31, 2012

I have 2821 router configured with two subinterfaces. This router is connected on cisco 2960 switch. The trunk on 2960 is configured without any prunning of vlans. I noticed that udp broadcast traffic is being forwarded through my router on native vlan 1 (this interaface do not have ip address configured). Below is configuration:
interface GigabitEthernet0/0
no ip address
duplex auto


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Cisco Switching/Routing :: Failover VPN With 2821 And ASA 5510

Jul 2, 2012

Currently I have a network that looks like this:
ASA5510 - - - Internet - - - ASA5510
     |                                             |
EIGRP                                 EIGRP
     |                                              |
2821 -----------MPLS----------1841
The MPLS connection is currently down, I'm trying to run a failover Site-to-Site VPN over the internet. All of the examples I've read have both connections involved in the failover coming out of one device. Since I'm not working that way, what is going to be the best way to failover? Do I need to set up some sort of IP SLA in the config? Or can I somehow weight routes in EIGRP in a way that the connection will failover from Internet to MPLS when the MPLS goes down and vice versa when the MPLS connection comes back up?

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Cisco Switching/Routing :: What Is The Maximum Nr Of VPN Clients On 2821

Mar 10, 2013

What is the maximum VPN Clients that could be connected to cisco router 2821, with this IOS c2800nm-adventerprisek9-mz.124-20.T.bin

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Cisco Switching/Routing :: 2960 - Software For Testing MAC Table Count

Feb 23, 2012

A Network Lab (governmental) did not let our cisco 2960s switches to be imported to the country and said "according to my lab tests, the maximum mac that your switch can learn is about 500 but as cisco says it should be about 8000"
they did not give me their software but i like to test it myself
Is there a software which generates thousands of MAC and inject them into switch to test the real amount shown in show mac count ?

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Cisco Switching/Routing :: SW2960G - Server Is Not In Mac Address Table But Can Ping Its IP

Oct 28, 2012

I have the switch ============>>>>>        
sw2960g============server linux
As u see above , the inetrface Gi0/6  , Gi0/7  are  connected directly to linux server  by two redundent links .
I mean that Gi0/6 is connected to interface0 in linux server
and Gi0/7 is connect to interface interface1 in linux server
Gi0/6===>vlan 1
Gi0/7===>vlan 2
each interface of linux server has a different ip and different gateway .
Now  from switch, I  make ping to interface 0 of linux server and i have a reply , every thing is ok but when i type the command :
#sh mac address-table  | i Gi0/6
There is no Mac addresses and seems no Mac address relative to Gi0/6, I mean that doesn't it mandatorty to learn the mac address of linux server and write in mac table  relative beside  interface Gi0/6 ? How I could ping the server but no mac beside Gi0/6 ?

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Cisco Switching/Routing :: WS-C6509-V-E / Mac-address-table Synchronize Command

Nov 27, 2011

we have  cisco WS-C6509-V-E with IOS version 12.2(33)SXI4; s3223_rp_IPSERVICESK9_WAN_M) running on a switch. I am trying to configure the command "mac-address-table synchronize" under global config mode. But when I enter the command Cisco(config)#mac-address-table ?It doesn't show the synchronize option?

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Cisco Switching/Routing :: 1841 Router Taking On ARP Table Entry

Dec 22, 2011

The issue is occuring on our local LAN where my ARP requests are being modified after a period of time by the router for one host.  I'm finding that the host will work fine with the correct MAC IP pairing for a period of time and then about 15-30 minutes later, the arp table is changing so the associated mac/IP address is now the mac address of the router interface.
The FastEthernet 0/1 port has no ip proxy-arp enabled and is set with ip nat inside.This only started happening after restarting the router, however the running config was saved as the startup config prior to the restart.I've tried hard-coding the entry with the command arp c82a.1459.0579 ARPA  however that is not working as expected.
The device is an 1841 ISR with the advanced IP Services bundle loaded.  Is there some way that the router is viewing my host (provides DNS, Directory Services) as a intrustion attempt and somehow rejecting the packets?

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Cisco Switching/Routing :: Create Different Policies For Vlans On 3750 Table

Jun 27, 2012

I am looking for a way to create different routing policies for vlans on a 3750 table.
My set up is 
Clients----------- 3750 -------------- ASA ---------------Servers
Internet Routers
What i am trying to do is on the 3750 to route private networks to my ASA on different subintefaces and all internet to my internet routers . Each VLAN has a different GW for the internet. On some case i have the ASA as a default gateway. ASA default default route is 3750 where i need the internet traffic to be spllited on the proper Boarder router.

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Cisco Switching/Routing :: 6500 Clarification For Using Mac-address-table Synchronize Command

Jul 12, 2010

We want to configure the "mac-address-table synchronize" command on our 6500 series switches to ensure that the CAM tables on our DFCs are in synch with the PFC on the supervisor modules. is recommended that we disable the routed MAC purging with the mac-address-table aging-time 0 routed-mac global configuration command. What is a routed mac entry?  Are there any issues with running that mac aging-time command?
We also plan to run this command "mac-address-table aging-time 14400" to keep our ARP and CAM tables on the same aging time to reduce unicast flooding on our network.  Can we run this command with the "routed-mac" command above?

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Cisco Switching/Routing :: High CPU For Catalyst 4500 K2L2 Address Table R?

May 8, 2011

My Catalayst 4507 is reaching up to 82% CPU utilization and I noticed that K2L2 Address Table R is causing the high CPU.
C4507#sh processes cpu | in HiPri|LoPri|CPU utilizationCPU utilization for five seconds: 82%/1%; one minute: 86%; five minutes: 87%  54   350533923 329104616       1065 13.27% 13.84% 13.86%   0 Cat4k Mgmt HiPri  55  1771768520 274992685       6442 59.91% 64.55% 66.04%   0 Cat4k Mgmt LoPri
 C4507#sh platform health | in K2L2|%CPuK2L2 Address Table R   2.00  66.35     12      5  100  500   91  82   58  27272:55K2L2 New Static Addr   2.00   0.00     10      0  100  500    0   0    0  0:00K2L2 New Multicast A   2.00   0.00     10      5  100  500    0   0    0  0:18K2L2 Dynamic Address   2.00   0.00     10      5  100  500    0   0    0  0:16K2L2 Vlan Table Revi   2.00   0.00     12      8  100  500    0   0    0  1:22

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Cisco Switching/Routing :: Catalyst 6500 - Netflow Table Utilization Logs

Nov 27, 2011

We are getting log messages like

%EARL-DFC4-4-NF_USAGE: Current Netflow Table Utilization is 95%
%EARL-DFC4-4-NF_USAGE: Current Netflow Table Utilization is 99%
What this messages really means and how to get rid of these messages. We are using IOS version 12.2(33)SXJ in Catalyst 6500.

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Cisco Switching/Routing :: Untagged VLAN On Subinterface 2821

Sep 8, 2012

I need to configure a subinterface eg g0/0.1 and g0/0.2 with a untagged VLAN for each subinterface on a Cisco 2821.

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