Cisco Infrastructure :: CE 1706 / PE 7206 - Multilink PPP Under Load
Apr 3, 2003
Customer site connected to a PE using 2 x E1 circuits aggregated using Multilink PPP. The CE is a 1760, and the PE is a 7206. This is the customer HQ site.
Connected to the same PE are three other sites from the same customer. Each is connected with a single E1, again each CE is a 1760.
During some testing the customer did some large file transfers concurrently from each of the three remote sites into the HQ, so we had data coming into the PE via the three E1's (6Mbps) and then being routed onto the 4 Mbps Multilink PPP interface into the HQ, which is a potential bottleneck. This test failed miserably with packets being dropped on the output interface on the PE facing the HQ.
But then if Multilink PPP encap is removed, and we just connect the HQ using one E1 with HDLC encapsulation, the test works, even though we have half the bandwidth to the HQ, so an even greater potential bottleneck.
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Jan 7, 2012
I have a DLSW connectivity between 2800 series router and 7206 router. AS 400 is directly connected to 2800 series router and other server is connected directly to 7206 router. now i want to add one more server which will work as backup for the server connected to 7206 . What would be the connectivity/configuration to make it working in case primary server connected to 7206 is down or connection would automatically needs to shift on its backup server.
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Sep 10, 2012
Whenever I want to turn off the ip cache flow and enter command "no ip flow egress" on a router interface, the router will self reboot and returned with the error message - System returned to ROM by bus error at PC message in the show version ouput.
I tried on two different routers below here and both also undergoing a cold restart when I key in the command "no ip flow egress" on the said interface
1) Cisco 7206 running IOS 12.4(1c)
interface GigabitEthernet0/1
ip address 10.20.10.2 255.255.255.0
ip flow egress
duplex auto
speed auto
end
when I key in "no ip flow egress" under int gi0/1 and the router self restarted and return the message Router uptime is 3 minutes System returned to ROM by bus error at PC 0x606D48FC,address 0x0
2) Cisco 3845 running IOS 12.4(3e)
interface GigabitEthernet0/0
ip address 10.20.20.2 255.255.255.0
ip nbar protocol-discovery
ip flow egress
duplex auto
speed auto
end
when I key in "no ip flow egress" under int gi0/0 and the router self restarted and return the message
Router uptime is 3 minutes System returned to ROM by bus error at PC 0x6007EBE0, address 0x0
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Jan 30, 2011
I have DS3's to two different providers. Each is hosted on its own 7206. The 7206's are connected to each other and both connections to the internet route traffic in and out just fine. Failover between the two is working as well. The issue I have is that one DS3 is used more than the other because it has the best route to most of our remote offices. I wanted to see if theres a way to make one of my routers posess a more attractive route to a given subnet. Of course, in the event of a router or provider failure, I would want the other router to start routing the traffic for that office.
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Jun 20, 2012
I use a cisco 2620 voice gateway with a module NM-HDV-2E1-60. Tell me how you look at snmp for Cisco 2620 load E1. For 2811, I found oid 1.3.6.1.4.1.9.10.19.1.1.4
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Oct 3, 2012
I have Cisco 2600 series Router which has only 32 MB flash memory. I tried to load IOS image in that but image size is 29 Mb in compressed form. The minimum i found is 5 MB in compressed form but it is missing so many commands. that in 32 MB flash, how can I load image which has almost all the commands.
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Feb 26, 2006
I have three E1 as a part of Multilink group. If any one goes down. loadbalancing between the rest of the two E1 does not work...
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Mar 7, 2012
I have a Cisco 1841,c1841-ipbase-mz.124-20.T4.bin, with 2x HWIC-1ADSL-M.I have managed to bond 2x DSL with PPP multlink with the config below and traffic is being sent equally across both DSL circuits. However if i disconnect either of the DSL cables connectivity fails. I was expecting connectivity to continue to work just over the one circuit. [code]
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Jun 15, 2011
I think I have my PPP multilink setup correctly. Though I am getting AL lights on one of my connections via a VWIC2-2MFT-T1/E1 card. One AL light is on at each location. Though I checked with my ISP and they said it was my network cables as everything looked good on their end. Currently one T1 circuit is connected at each end so users do not see a disruption. This is a new install with two routers and the config is shown below.
Router 1-----
controller T1 0/0/0
cablelength long 0db
channel-group 0 timeslots 1-24
(code)
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Feb 18, 2013
I have a Cisco 2821 with two serial interfaces bundled using PPP multilink. I want to monitor traffic flow (net flow) on the multilink interface. I have tried configuring ip route-cache flow/ ip flow ingress / egress but no luck.The other thing is when I do sh ip cache flow I guess I should see the multilink interface in both Source and destination columns which is not happening (not showing in destination column).The other router with same config but with ATM sub-interface working properly (same IOS). Are there any hits on this ? Also, is it possible to use SPAN feature ? The monitoring server is at some other site (coming via WAN).
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Feb 6, 2013
I have two Cisco Routers 3800 series for my internet traffic (2 ISP). I configure HSRP on the interfaces gigabitethernet and at the main router I put the multilink interface to track. When the connection drops to the main router traffic does not switch on my second router.
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Jul 18, 2011
I am looking for any other compression methods I can use for my PPP multilink connection. The PPP multilink compression is composed of two T1 lines. There are no slip sec errors or packet errors that I saw recently. R1 is a 1911 and R2 is a 2911.
R1 sh compress:
Multilink1
Software compression enabled
uncompressed bytes xmt/rcv 184340310/27355186
compressed bytes xmt/rcv 126395743/14139585
Compressed bytes sent: 126395743 bytes 774 Kbits/sec ratio: 1.458
[code]....
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Oct 16, 2011
I have a question regarding mlppp and bonding mpls T1 circuits. For the longest time we have been able to get by on one T1 circuit coming into our 3845 router. Well this T1 has now become congested and they are wanting to add bandwidth to this T1. We connect to the phone company via an MPLS T1 currently. So now it appears as though we are going to purchase another MPLS T1 circuit and bond the two T1's together. The way our network is currently set up, we utilize the same AS number on all of our remote routers regardless of location. Keep in mind I don't have any sort of mlppp set up at this moment, so unfortunately I can't post any configs. I'm just questioning the design portion and how to go about doing this.
Here is where my dilemma begins........
For every MPLS circuit we order on the remote end, we specifiy an IP for the remote router itself and one for the provider to assign to their equipment (the bgp neighbor statements). Now granted i'm no BGP extraordinaire, not even a novice really, but I don't understand how I am going to bring two T1 circuits into the same router (basically with 2 pairs of IP's). In order to bond the two T1's together, i'll need to create a multilink interface and assign an IP to that, but yet I still have 2 SETS of ip addresses. And if that isn't enough of a dilemma, I also need to spedify a neighbor statement in order for my AS to bind to the adjacent provider AS, but yet I have two IP addresses for that as well.
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Feb 14, 2012
MPLS customer with 4 T1s in a multilink. If one of the T1s drops there is a brief delay in traffic picking back up and I actually lose packets from premise back to CO. You can see this loss both with pinging across the circuit and with techs on either end running JPerf. It can take as long as 6 seconds for the reconvergence to actually happen on the multilink and traffic picks back up. In my experience this is normal behavior for Mulitlinks
I'd also like to note that it is indeed much quicker reconvergence when you physically pull the T1, any of the T1s, rather than administratively shutting down one of them and I understand that the hardware is quicker than software and that's a good thing, obviously. I've tried this with and without ppp mulitlink fragment disabled on either end and every other combo between the two. Each of the 4 serial interfaces are on line timing and I tried free-running just on the off chance that it could imrpove the loss, but it gets worse.....back to line timing. I've even tried this on other CPE platforms like two different versions of Adtran CPEs and I get the same thing. Currently I have a new 2821 CPE in place and still get the same thing. Still see a brief amount of traffic loss up to 6-7 seconds or so at times.
7600 side:
interface Multilink592
ip vrf forwarding ******************
ip address *************************
load-interval 30
no peer neighbor-route
ppp multilink
ppp multilink group 592
ppp multilink fragment disable
no cdp enable
service-policy output VPN-TEMPLATE-2(code)
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Oct 15, 2012
I am configuring ISDN Interface on 2 Cisco 886VA Version 15.2(3)T . I am unable to set ppp multilink on the BRI0 interface and on the dialer interface. It's like the command doen't exist anymore.How can I fix that so that i can have 128 K bandwidth between ma 2 sites ?.
Router1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router1(config)#int bri0
Router1P(config-if)#ppp multilink
[code]....
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May 8, 2012
I have configured multicast (ip pim dense-mode) on two 2911 routers that are connected by a Multilink (3Mbps) Wan connection.The configuration work fine for awhile and sometimes all day but at some point one of the Multilink interfaces stop passing multicast traffic.I perform a sh multilink 1 on the interfaces and one interfaces show the multicast packets incrementing and the other does not, it just stops.The only fix for this is to hard reboot both routers and the multicast traffic begins to flow once again.
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Jan 5, 2011
We have 4 data T1s providing our office with 6Mbs of internet bandwidth.I have been trying to track down the reason(s) for the steadily increasing frame and abort errors on the Multilink interface of our new router.We have a new 2961 with 2 2 port T1 interface cards (VWIC2-2MFT-T1/E1).
At first it looked like the T1s were completely clean, but after diving down a bit the last of the 4 T1s does appear to have a decent amount of slip and error seconds.Is that something that would cause the Multilink interface to show input, frame, and abort errors?Any config or debug commands I should start with to narrow down what might be causing this problem?
Config snippets:
card type t1 0 0card type t1 0 1!controller T1 0/0/0clock source internalcablelength short 440channel-group 0 timeslots 1-24description HCFD-XXXXXX!controller T1 0/0/1clock source internalcablelength short 440channel-group 0 timeslots 1-24description HCFD-XXXXXX!controller T1 0/1/0clock source internalcablelength short 440channel-group 0 timeslots 1-24description HCFD-XXXXXX!controller T1 0/1/1clock source internalcablelength short 440channel-group 0 timeslots 1-24description HCFD-XXXXXX!interface Multilink1ip address X.X.X.X 255.255.255.252ip nat outsideip virtual-reassemblyppp multilinkppp multilink group 1ppp multilink fragment disable!interface Serial0/0/0:0description T1 : HCFD-XXXXXXno ip addressencapsulation pppppp
[code]....
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Nov 1, 2011
I just finished setting up a bundle of (2) T1's in a multilink bundle and I'm having issues with one of the T1's not wanting to join the bundle.
The router I'm using on the remote office location is a 3620 router running code c3620-i-mz.121-1c.bin
The campus router which is a 7206 is setup the same exact way with multilink 240 and like I've said, serial 0/0 is joined to the bundle just fine, so we are running off one T1 connection.
The serial interface that is not working is: serial 0/1
Here is a show-run:
interface Multilink240
ip address 172.18.xxx.xxx 255.255.255.252
ip route-cache flow
ip ospf network point-to-point
service-policy output PhonesFirst
ppp multilink
[code].....
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Jun 11, 2012
One of my customer has raised a new requirement for implementation of short sequence number format support in PPP multilink header for Cisco MWR 2941 E1/T1 serial interface, whereas router is supporting long sequence number format.here is the output of "debug ppp negotiation" command:-Currently in the MWR debugging logs we can see that by default MWR is sending long sequence header format as below
*Mar 13 01:32:55.438: Se0/2:0 LCP: O CONFREQ [REQsent] id 238 len 25
*Mar 13 01:32:55.438: Se0/2:0 LCP: MagicNumber 0x26CDF693 (0x050626CDF693)
*Mar 13 01:32:55.438: Se0/2:0 LCP: MRRU 1500 (0x110405DC)
*Mar 13 01:32:55.438: Se0/2:0 LCP: EndpointDisc 2 16.16.16.11 (0x1307021010100B)
*Mar 13 01:32:55.438: Se0/2:0 LCP: MultilinkHdrFmt seq long classes 2 (0x1B040202)
While as per the requirement PPP multilink header should support short sequence.
MWR configuration:
controller E1 0/2
framing NO-CRC4
clock source line
channel-group 0 timeslots 1-31
[code]....
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Feb 9, 2011
SSH is not working in Cisco 7206 VXR Router. I have configure
Hostname
Ip Domain name
Crypto key generate RSA
IN Line VTY 0 4
transport input preferred SHH
transport input telnet SHH
But stll it is not working. I am getting invalid crc recieved in packet.
Current IOS running is 12.3 (19) Enterprise 3des
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May 12, 2011
I have two 7206 VXR routers with the VPN Service Adapter either side of a leased line (i.e. no provider between, pure layer two connectivity)A requirement is that traffic traversing the link is encrypted so I've configured an IPSec VPN between the two endpoints.During load testing we noticed a very severe performance hit when the VPN was enabled, disabling it again saw we were able to use almost 100% of the 1000Mbs line. The performance hit looks to be due to the increased MTU size when using IPSec, possible due to fragmentation.
I've read that the 7206 VXR can support 980Mbs (or there abouts) of throughput using AES providing the MTU size is 1400.Configuring this manually on each server in each data centre isn't feasible.As the link is effectively a point to point and we have control over the MTU size between the two routers, what options are available to increase the performance when the VPN is enabled?
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Mar 2, 2011
I am attaching my current network topology, My problem is that i am having mpls & p2p link terminated on the 7206 router left side of diagram. now my problem is if i apply PBR on this 7206 router & tracer any host which are on right side of the diagram, it drops on IP 10.1.1.1..ideally it should go to my Core switch on right of the diagram.
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Feb 24, 2011
I am having a Cisco 7406 VXR router. I want to know what is the max. MPLS link capacity that can be terminated on the link? We are planning to upgrade the MPLS link to 450 Mb..so was just wondering whether 7206 will support or not..
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Mar 9, 2011
I have a problem in understanding how LLQ is implemented in different platforms of Cisco.QoS should kick in only when there is a congestion in the link irrespective of queueing / scheduling (LLQ and CBWFQ).But in certain platforms like GSR and IOS-XR, LLQ is confiugred only with priority and police command not with "prioirity percent <value>" command. In priority and police command since policer is used, LLQ is always on even there is no period of congestion. Of course with police you can re-mark the exceed traffic to different marking but thats not the requirement in my case.
In platforms like 7206, LLQ is configured with "prioirty percent <value>" which works ideally only when there is a period of congestion. When there is no congestion, LLQ class can use scanvenge other classes as well.Would like to know is there any specific reason why there is a difference in the implentation of LLQ between different platforms of Cisco.
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Mar 14, 2012
I need to upload IOS c7200-advipservicesk9-mz.124-15.T16.binin 7206 NPE 400 router , As per cisco recommendation router should have DRAM : 256 MB ; Flash : 64I think my router contain only DRAM= 128 MB but not sure.
how much DRAM & Flash it contains.
Router1#sh versionCisco Internetwork Operating System SoftwareIOS (tm) 7200 Software (C7200-IK9S-M), Version 12.3(1a), RELEASE SOFTWARE (fc1)Copyright (c) 1986-2003 by cisco Systems, Inc.Compiled Thu 05-Jun-03 20:58 by dchihImage text-base: 0x60008954, data-base: 0x61E0C000
[Code].....
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Mar 9, 2013
I'm getting below error on 7206VXR (NPE-G1) with IOS "c7200-js-mz.124-3i.bin".Attempt to use contiguous buffer as scattered.[code]
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Mar 27, 2013
How can I enable Console port in 7206 vxr with NPE-G2 card installed, I need to use console from NPE G2 card.
The device turns on and status is also UP and I can also telnet to the device but I am not able to access the device through console port...
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Oct 1, 2012
i did in past a lot of L2TP connection between two end point. in this case ans with 2911 series with ios 15 and DATA license Activated. the l2tp session does not establishe between a this 2911 and 7209. Attached is topology file and bellow the configuration of both router.
PE 2911
l2tp-class l2-dyn
authentication
password 123456
[Code]....
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Mar 4, 2012
I have a lot of cisco 7206 vxr deviceses. I have a high cpu problem.I have a 7206 vxr g2. I used to use ebgp for three upstream carrier. I used to bgp full route table method. I have about 800 Mbps active traffics and behing the router about 1600 active customers.
How can I trouble shoot this high cpu problem?
#sh int gigabitEthernet 0/1
GigabitEthernet0/1 is up, line protocol is up
Hardware is MV64460 Internal MAC, address is 000c.cf1d.d01b (bia 000c.cf1d.d01b)
Description: ***** GW Interface *****
[Code]....
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Apr 24, 2012
In Cisco 7206 VXR (NPE-G2) router , the CPU utilization is at an 80-90% always , but none of the process is consuming not more than 1%. In the show stacks output we are observing network interface interrupt is called very frequently. so what does network interface interrupt is about. Logs for the reference: show process CPU sorted
CPU utilization for five seconds: 88%/88%; one minute: 89%; five minutes: 89%
PID Runtime(uS) Invoked u Secs 5Sec 1Min 5Min TTY Process
1 0 72 0 0.00% 0.00% 0.00% 0 Chunk Manager
2 20020000 17159 1166 0.00% 0.02% 0.01% 0 Load Meter
[Code]...
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Jan 18, 2012
I have a scenario with a Cisco 6506 and a 7206. The 6506 is running BGP and peers with our data center router. The 7206 is a stub router off the 6506 and is used as an edge router for customer T1 circuits. I want to use OSPF between the routers to exchange connected and static routes. The problem I have is that static BGP null routes on the 6506 are overriding the OSPF routes being received from the 7206. Example: The 6506 is advertising a class C network 192.168.1.0/24 to our data center. The 6506 does not utilize the 192.168.1.0/24 network. It is only used on the 7206 for customer T1 circuits and is carved up into /29 subnets. So the 6506 has a static route: ip route 192.168.1.0 255.255.255.0 null 0. Today the routing is accomplished with static routes on the 6506 for the 192.168.1.0 networks on the 7206. Using OSPF the 7206 advertises /29 links back to the 6506, but when I withdraw one of the /29 static routes from the 6506, the /24 null route takes precedence over the more specific /29 routes and the traffic is black-holed on the 6506. how can I get the OSPF routes to look preferable to the /24 null route on the 6506?
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May 22, 2011
I would like to find out what the status is of the Cisco 7204 VXR and 7206 VXR routers?I understand they are EOLife and EOSale.Are they also EOSupport? we planning to upgrade 3 of them in our environment and management requires feedback around this.We thinking of going the ASR1000 route..
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Jun 17, 2013
One of end costumers is trying to configure IP Accounting on 7206 running version 12.4(4)XD8,The issue we are having is that while the physical interface is up (the sub interface is part of a metro line which is directly connected) we dont see packets being accounted if the destination IP is down.
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