Cisco WAN :: BGP Flapping After Upgrading 7600-SUP720 To 12.2(33)-SRD8?

Jan 23, 2013

We have a Cisco 7600 Router with SUP720/MFSC3 that was running version 12.3(33)-SRC3 for more than 2 years now. We recently had to upgrade to a newer release to solve a bug issue after recommendations, so we chose to go to SRD8 release. Since then we are facing a rather strange problem with one of my peer ebpg. we have 2-3 peering on the same router. only one of them is affected. The ebp keeps flapping every 3 minutes due to hold down timers.
12:14:33: %BGP-5-ADJCHANGE: neighbor Down BGP Notification sent
12:14:33: %BGP-3-NOTIFICATION: sent to neighbor 4/0 (hold time expired) 0 bytes
12:14:33: %BGP_SESSION-5-ADJCHANGE: neighbor IPv4 Unicast topology base removed from session  BGP Notification sent
12:14:47: %BGP-5-ADJCHANGE: neighbor Up

We asked our peer if they have similar problems but it seems they do not. Our peer is using Cisco 12810 running  12.0(32)SY11 After downgrading back to version 12.2(33)SRC3 again, the probem was fixed...

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Cisco WAN :: 7600 - QoS On Sup720?

Oct 16, 2012

I have a strange QoS problem with one Cisco7600 (sup7203BXL, IOS 12.2(33)SRE6).
This is layer 2 traffic,and all ports are L2 dot1q trunks:
1) Packet comes with DSCP 46 on Gigabit port (WS6728-SFP) with "mls qos trust dscp" configured. It goes out the port of the same card/slot with DSCP 0.
2) packet comes with DSCP 46 on different Gigabit port on the same card/slot with "mls qos trust dscp" and also "mls qos vlan-based" configured. It qoes out out the port with DSCP 46.
Why the switch behave differently if "mls qos vlan-based" is configured on port (or to say it works correct since it doesn't override DSCP)?
I have global command "mls qos rewrite ip dscp" since this 7600 is also MPLS PE router and I found in documentation that "mls qos rewite ip dscp" is mandatory for QoS on MPLS (EXP bits). So I can't turn off "rewrite ip dscp". Again the problem that I presents is L2 problem not MPLS (MPLS is used for different traffic).
Also mls qos mappings are ok COS to DSCp are 5 to 46 and vice versa.
Furthermore, as far as I know if I have configured "mls qos trust dscp" on Gigabit ethernet port, switch (7600) should work in this order:

- make internal DSCP from packet DSCP

- since I don't have configured DSCP mutation DSCP should stay the same (46)

- using map DSCP - COS ( 46 -5 ) switch will choose queue on outgoing interface in regards to mapped COS

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Cisco WAN :: BGP Flapping Peer With ASR1002

Oct 18, 2011

We are having an issue with BGP flapping peer. We have a ASR1002 as Route Reflector and it work fine with all peers except with 2 peers.

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Cisco WAN :: 819 DDR With Floating Static Route - 3G Flapping?

Dec 7, 2011

I have a new Cisco 819 router wtih Verizon 3G built in.  I want to use this router to provide 3G backup Internet access for a customer kiosk.  The 3G is perfectly stable when I use it as a primary, static routed connection.  When I use a floating static route, the link goes up and down constantly.  The 3G link works for a about 20-  30 seconds, then goes to reset, down, then dials up and reconnects. 

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Cisco VPN :: EZVPN Between 2811 And SR520 Flapping

Mar 31, 2011

I am having an issue get an EZVPN working between a 2811 server and a SR520 client. The symptoms are the SR520 makes multiple connection attempts to the 2811.  It appears that sometimes these connections are successful and the SR520 is assigned an IP address but then the tunnel will be dropped and a new session will be started.  I've attached scrubed configs for both the 2811 and the SR520. One other note, when connecting to the 2811 with a software VPN client, there are no problems, so I think the problem is with the SR520.  On the other hand, the SR520 wasn't having any problems until we switched our VPN server from a UC520 to the 2811.

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Cisco WAN :: 6509 / Flapping Interface On A Router?

Nov 20, 2012

I am trying to determine a problem with flapping interface on a router  not showing up in log buffer if Cisco IOS. I've included the config on  the switch that pertains to the logging and can't seem to figure what is  going on. The SNMP trap is being sent to our Central Management trap  server and that is reporting the interface flapping but the flap doesn't  show up in the log messages.

hstir1#sh int desc | inc 8/33
Gi8/33 up up
hstir1#sh int desc | inc 8/33
Gi8/33 down down


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Cisco WAN :: 888-K9 CO And CPE SHDSL Connection Flapping Every Few Minutes

Jan 17, 2013

I have two Cisco 888-K9 setup on a 4 wire private line about 2-3 km apart one configurated as CO and the other as a CPE. During config and testing the SHDSL connection was completely stable although this was only over about 300m of CAT5e. Now the devices are installed the in field I'm finding the connection constantly comes up and down every minute or so which leads me to suspect noise or line quality is the issue. How to debug this and tweak the setting to improve stability? Config from the CO & CPE attached along with DSL controller output from active and non active connection on the CO.

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Cisco WAN :: ASN 65500 / IBGP Peering Is Flapping?

May 15, 2013

Topology :
PE router-T (ASN 1111) ----eBGP---- CE router-T (ASN 65500) ----iBGP---- CE router-V (ASN 65500 ) ----eBGP---- PE router-V (ASN 2222)                  
When We have configured in this mannger everything is working fine. Only thing is that I can not receive all the NEtwork updates coming from PE- Router - V in CE router T. It's due to synchroization rule (I have not tunrned off synch in CE Router T.) Now for Load sharing purpose I have applied one Route map on iBGP peering from CE Router V to CE router T in OUT direction  mentioning any routes coming via ASN 65555 than set Local Preference = 150 and will prefer path via MPLS SP - V. Rest via MPLS SP - T.
But as soon as I have applied the Route-Map. It's not reflected.When I have applied clear ip bgp * on CE rotuer - V than I can see two routes in CE router - T with LP 150 and default. Everything is working OK.
When trying to check the auto failover by Shuting LAN int of CE router-V --- Failover is also working via CE router-T.When reenabling the LAN int  ----- After that iBGP perring is flapping continuolsly. Finally We have remove the route-map ad it was stable.
find the route map :
CE Router - V
router bgp 65500
address-family ipv4


I have also checked the MTU issue between these two Peer (LAN int. of both the CE routers) by pinging each other with size 1500 with df-bit set.

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Cisco WAN :: 887M 3G Modem - Link Flapping?

Nov 18, 2012

I've been handed an 887M with a PCEX-3G-HSPA-R6 card in it, and asked to get it working on the big, bad internet.I've managed to get it to the point that it at least *tries* to connect to the internet over the 3G network - but I've run into a problem I can;t, for all my google-fu, find an answer to.
Details - Router is an 887M/K9, running 15.1(1)T1. 3G SIM is confirmed OK (I've put it into my laptop, which has a cellular modem, and it works fine).
What happens is that the ce0 interface connects, and then immediately drops, and goes into reset mode. I'm stuffed if I know why - not sure if I need to do a firmware change to it, or soemthing else to the config.
Config (which is very basic - I just want it on the internet before I get fancy) is below
Router#sh run
Building configuration...
Current configuration : 1504 bytes
! Last configuration change at 03:48:36 UTC Tue Nov 20 2012
version 15.1

It *seems* to come up, but immediately drops out, and I can't figure out why.

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Cisco WAN :: C2921 - EIGRP Flapping Through Sub Interface

May 8, 2012

I get some EIGRP flapping on my CE router (c2921) 2 sub interface to another two site. The router IOS version "c2900-universalk9-mz.SPA.152-2.T1". I capture the debug log as attached. I know understand some log meaning from the debug.

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Cisco WAN :: 6509 - MAC Address Flapping In Core Switch

Dec 28, 2010

I am getting following error in Cisco 6509 switch.BUt there is no impact in the switch.
: %MAC_MOVE-SP-4-NOTIF: Host 0000.0c07.ac01 in vlan 694 is flapping between port Te8/1 and port Te7/1
29:33.959: %MAC_MOVE-SP-4-NOTIF: Host 0000.0c07.ac01 in vlan 269 is flapping between port Te7/1 and port Te8/1


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Cisco Switching/Routing :: VLAN Flapping In 3750x

Sep 22, 2011

I recently upgraded my network to have two 3750x core, one interface on the cisco is connecting to a Netgear switch via a fiber converter. I am keep getting the vlan flapping error message in my log as below.

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Cisco Wireless :: Mac Address Flapping Between C3750 / WLC 5508

Jun 23, 2011

we have coonection between c3750 and wlc 5508 and it shows that mac address flaps between two interfaces of c3750. [code] two ports are trunking and one port is for management purposes and the other port is for the all other vlans. But it shows that it flaps always. And i think WLC uses one mac address for all device and not for port specific and that causes problem.

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Cisco Switching/Routing :: HSRP Flapping On 7604?

Jul 9, 2012

i have 2 cisco 7604 distrubution routers .Both routers are running 310 hsrp groups.
Sundenly there is hsrp flapping which causes high CPU.
What is the limitation of HSRP group on cisco 7604 router .Below is the show ver from the router
----------------- show version ------------------
Cisco IOS Software, c7600rsp72043_rp Software (c7600rsp72043_rp-ADVIPSERVICES-M), Version 12.2(33)SRC2, RELEASE SOFTWARE (fc2)


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Cisco Switching/Routing :: C1240 - Mac Flapping With VLAN 25

Apr 14, 2013

i have a question, i have in the logging of my switches a mac falpping problem. i have a log notification : Apr 12 19:33:13: %SW_MATM-4-MACFLAP_NOTIF: Host xxxx.f065.520c in vlan 25 is flapping between port Gi0/1 and port Fa0/35. When i look up what is connected to interface FA0/35 it is a accespoint " AIR-AP1242G-A-K9"  Cisco IOS Software, C1240 Software (C1240-K9W7-M), Version 12.4(21a)JA1, RELEASE SOFTWARE (fc1)
How this is making the mac flapping ?

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Cisco WAN :: Interface Flapping Lost Carrier With 2951

Nov 1, 2012

Having an issue that we have with a CISCO2951/K9. It connects to Internet through the GigabitEthernet0/1 interface. Since a few days ago, the Gi0/1 interface is flapping many times in a day:

100468: Oct 30 12:16:28 CST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to down
100469: Oct 30 12:16:29 CST: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to down
100474: Oct 30 12:17:08 CST: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up

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Cisco Switching/Routing :: 4500 / Flapping Between Ports?

Jun 27, 2012

We have been receiving these notifications on one of our core.
Jun 28 12:54:01: %MAC_MOVE-SP-4-NOTIF: Host b407.f9c3.3c51 in vlan 56 is flapping between port Po5 and port Te7/2
Jun 28 12:54:01: %MAC_MOVE-SP-4-NOTIF: Host 145a.05c8.0ed3 in vlan 802 is flapping between port Te7/2 and port Po5
Jun 28 12:54:01: %MAC_MOVE-SP-4-NOTIF: Host 9463.d129.546a in vlan 56 is flapping between port Gi2/9 and port Po5
Jun 28 12:54:01: %MAC_MOVE-SP-4-NOTIF: Host 3c43.8ef3.7448 in vlan 56 is flapping between port Gi2/9 and port Po5
Jun 28 12:54:01: %MAC_MOVE-SP-4-NOTIF: Host 000e.35eb.25ae in vlan 66 is flapping between port Po5 and port Te7/2
PO5 goes to our primary wireless controller.  Gi2/9 goes to a Cisco 4500 switch that also has a PO5 on it for a failover lan controller and TE7/2 is another core switch.
These mac-address all seem to point to PO 5 which is the port channel assigned to Wireless Controller interfaces.
How do I determine if this is a spanning-tree loop?  No ports are err-disabled. 

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Cisco Switching/Routing :: WS-6148A - Port Flapping Due To MTU Mismatch?

Jun 4, 2012

We have some legacy Cisco 6513 switches with the backbone (16-port GBIC blade) MTU set to 1500.  It has a WS-X6148A-GE-TX blade as well, MTU set to 9K.
Now we have a customer sending MTU of 1546, their copper interface terminating on WS-6148A keeps flapping.  Does the flapping have something to do with the backbone set to 1500?  We cant set the backbone to 9K at this moment since it may be intrusive (reuire a reboot).

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Cisco Wireless :: Etherchannels Flapping / Stacked 3750 To WLC5508?

Feb 18, 2013

We're running two 5508 WLCs running pushing out 7 WLANs.  They are both live.  Each WLC is connected to the same stack of 3750G running 12.2(44)SE6 via Etherchannels.I'm getting tons of MAC flapping errors similar to this:9373213: Feb 19 10:53:54.564 CST: %SW_MATM-4-MACFLAP_NOTIF: Host 843a.4b3c.4cec in vlan 752 is flapping between port Po12 and port Po11Each portchannel consists of ports on each of the two switches in the 3750 stack.  Only VLAN 752 shows the flapping activity. LAG is enabled on the each of the WLCs.  The portchannel and interface configs are identical, minus the channel-group command of course.Maybe completely unrelated....looking at CDP neighbors from the switch is incorrect:

WLC1             Gig 2/0/44        157            H       AIR-CT550 Gig 0/0/1
WLC1             Gig 1/0/21        157            H       AIR-CT550 Gig 0/0/2
WLC1             Gig 1/0/20        157            H       AIR-CT550 Gig 0/0/3


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Cisco Switching/Routing :: WS-C2960S-24TS-L / Mac Flapping On Stack?

Feb 27, 2012

We have two switches WS-C2960S-24TS-L running in stack with running IOS c2960s-universalk9-mz.122-55.SE3.We have connected two checkpoint devices on Gi1/0/24 and Gi2/0/24 with a simple configuration:
interface range GigabitEthernet1/0/24, gi2/0/24
switchport access vlan x
switchport mode access
spanning-tree portfast
On the devices log we get the following message:

%SW_MATM-4-MACFLAP_NOTIF: Host 0000.0000.fe21 in vlan x is flapping between port Gi2/0/24 and port Gi1/0/24
The mac-address 0000.0000.fe21 is not found on any checkpoint interface. "Show mac-address int gi1/0/24 or gi2/0/24" does not show the correct mac-address of the checkpoint interface connected to the port, but instead shows 0000.0000.fe21.Is there a bug in the IOS, something wrong with the switch config or does it have something to do with the checkpoint config?

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Cisco Switching/Routing :: 1941w - EIGRP Continually Flapping

Nov 15, 2011

This is the message that I am getting from my 1941w router. I have a isakmp tunnel built with a GRE tunnel going through it.

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Cisco Switching/Routing :: 3750G Access Layer Mac Flapping

Mar 28, 2013

Lately I have been noticing mac flap messages on some of our access layer 3750G switches. Just a little background on how this is setup.
These 3750G switches are stacked and uplinked to a distribution layer 3750E stack (2 switches) via cross stacked etherchannel. (Usually 4 links) The access layer switches are stricly layer 2 where the distribution layer 3750E is routing the VLANs at the access layer to to the core 6500 switches.
I have just about ruled out physical loops on these stacks for the reason that the Macs are flapping. I am seeing this on two different stacks now each having 3 switches in the stack at the access layer. The cross stack etherchannel is spanned across the first two switches at the access layer and connected to both switches at the distribution layer. I have checked the etherchannel status and all ports appear to be part of the etherchannel and they appear fine.
The mac addressses that are flapping are just plain old desktop machines that plug directly into the access layer. I usually see this when the mac is learned on a port such as when a machine is plugged into the network or reboots.

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Cisco WAN :: 3750 EIGRP Session Flapping For Seconds / Minutes

Apr 9, 2013

we are facing issue for unstability of EIGRP neighbor with ISP router.Both router are connected via 3750 switch.There is no misconfiguration or physical media issue.I found the SDM template on the middle switch is desktop default, does this will impact ? [code]

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Cisco Switching/Routing :: 4506e Host Flapping Between Ports

Dec 6, 2012

Two days back my entire network was behaving in unusual ways.When is connect to core switc(4506e) through console. [code]

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Cisco Switching/Routing :: 4507 - SNMP Configuration For Mac Flapping?

Mar 5, 2013

Would like to ask whats the correct snmp config so that it will send to our snmp server when a mac flapping occurs on a cisco switch specifically 4507 switches.

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Cisco Switching / Routing :: 3550 - Line Protocol Flapping

Aug 27, 2012

I work for a Wireless ISP and the device impacted is the back haul radio into the site. I have swapped from a 2950T to a 3550. Replaced the radio, PoE, patch lead. We have re ran the cable up the tower using shielded outdoor cable with a drain wire which has been earthed to an earthing block in the cabinet. We have other devices on the tower not experiencing the issue. We suspect cable interference however am now at a loss to diagnose further.


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Cisco Switching/Routing :: 2960 Switch Ports Flapping

Feb 4, 2013

I have a 2960 switch and every then and now the ports are flapping, while i was on console i saw ports going down and coming up...when the ping to machine ip addresses timed out the port status on switch was still errors collisions seen on sw port. Below is sh int when the port was flapping

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Cisco Wireless :: 5508 / WLC Port Channel Host Flapping

Oct 9, 2011

I have setup LAG for one of our 5508 controllers and have connected 4 of the 8 ethernet ports to a 4507 switch. After configuring 2 port channels on the switch we are receiving a host flapping error between the port channels and it seems to be causing a serious slowdown on the switch. When I shutdown one of the port channels the error goes away and traffic returns to normal. I have the same configuration at other locations with the only difference being the switches used are 3750G-12S and I do not see the host flapping error. It appears to only be a problem with modular switches.
One other thing of note: I read a Cisco white paper on LAG and it suggested creating the port channels over 2 different modules. For example, put ports G4/24 and G5/24 in port channel 1 and G4/25 and G5/25 in port channel 2. I tried this but I still got the host flapping error.

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Cisco VPN :: 6500 Sup720-3B SPA IOS SXI - GRE Tunnel Will Not Come Up

Apr 26, 2011

Cisco 6500 Sup720-3B SPA IOS SXI  - GRE tunnel will not come up.It worked fine on SXF code, but the crypto map can not be applied on tunnel interface.The iskmp is up with the OM_IDLE The crypto give it a Cryto UP, the the Tunnel does not come up.  It is UP down.Does some one have a working config with a 6500 IOS SXI Train with GRE IPSEC Tunnel?

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Cisco WAN :: SUP720 / GRE Traffic Which Is Not Processed In CEF?

Jan 10, 2008

we have some problem with GRE traffic which is processed by CPU and not by CEF.In sniffed packets I can see a lot of "TCP window update" packets.  I found that some kind of GRE traffic are forwarded to CPU, like packets with IP options or TTL=0 but non of those are seen in the sniffed packets.

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Cisco Switching/Routing :: 6509 Vlan Flapping Between Port-channels

Mar 10, 2012

We have a pair Cisco 6509 switch in which 2 * 48 Port 1G line cards and 1 * 16 Port 10G line Card, FWSM and Sup 720 are installed.We have Cisco UCS and HP Blade servers.Cisco UCS servers are connected to Cisco 6509 switch using Fabric Interconnect, and HP Servers are directly connected to core switches.Recently the team made many changes in the network. Upgraded the IOS in Cisco 6509 switch, Configured Port profiling , MAC Pinning , HBA Cards to UCS / Nexus 1000V Infrastructure. After this change they lost the connectivity to UCS and HP Serers. Every tower is checking at their end.
The Network Team has reverted back the core switch with old IOS , but still the problem persisit.I could only see the following error log in the core switch. There are two port-channels one between core 1 and core 2. The other is between core switch and FWSM module. [code]

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Cisco Wireless :: 3560X / Duplicate MAC Entries Causing Port Flapping?

May 8, 2012

I have multiple wireless access points plugged into a 3560X.  When the wireless clients begin roaming they cause duplicate MAC enteries to be created and this causes the switch ports to flap.  Is there a way to configure the switch to either ignore the duplicate MAC enteries on the switchports that have been connected to the APs or is there a way to have the ARP tables update and resolve the conflicting MAC enteries with out causing the switchport to flap?

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Cisco Switching/Routing :: Flapping Between Router (2811) And Switch (2960)

Jul 23, 2012

we have cisco 2960 switch which is connected to a cisco 2811 router. flapping issue between these two devices??
The following actions i have taken, but no result.. I have changed cables. have set speed to 100 and duplex full on both the interfaces but the interfaces are showing up up still not getting connectivity. same i have to auto on both sides still no result what configurations should i set to resolve this issue...?

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