Cisco WAN :: 7204 - Small Packet Size And Full BGP Table
Feb 7, 2012
I'm looking for a Cisco device to run a full BGP table with a 60Mb link. And one of the main restrictions is that my traffic is almost 100% real-time (voip). So the average packet size is small. Today we own a Cisco 7204 NPE400 with 512Mb RAM. I think even though I upgrade it to a G2, due to the small average packet size, the router will be near to its limit. Maybe a Cisco 7300 NSE-150? Or should I think about a switch?
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Jan 26, 2013
I have recently installed a Cisco 2911 ISR G2 with the default 512 Mb DRAM intending to eBGP peer. I ordered the 2GB upgrade RAM however due to time constraints on backordered parts, I fired up this router and eBGP peered without it. The Peer advertised the whole route table with 400,000+ routes. The BGP session came up then the router crashed due to not enough memory. The router disabled IP CEF due to insufficient memory. I disabled IP CEF permanently and have been running the router in this condition for 3-weeks with a stable eBGP session. This resulted in no CEF, 25% CPU during light traffic, 89% memory, and 50% CPU when traffic is around 30 Mbps through the router.
I am experiencing a hit to the throughput resulting in a lost packet and practically a brief traffic stall roughly every minute. This hit is so quick that it does not always result in packet loss and IP traffic sessions are not reset. I do see this on my live bandwidth graphs that the traffic takes a dive every so often, roughly 1-minute.
I initially thought this problem could be L2 to the upstream eBGP peer but all interfaces are clear of errors. I also thought this could be the BGP session going down, however, It is always up. I thought this could be duplex mismatch on L2, however its solid and no logs on either end. Funny thing is pinging thr router from both the LAN side and the WAN side results in the same packet lost every minute or so.
Even though the CPU and memory always stays the same at under 20-50% CPU and less than 89% memory, do you think this could be the BGP Scanner walking the routing table every minute?
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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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Oct 28, 2012
This is a bit of an odd question because it's about a problem I ran into a year or so ago, but I wasn't aware of these forums at the time, so I thought I'd run it past you all. Unfortunately that means I can't reproduce the problem right now, so it's kind of a theoretical question.
A while ago I tried to deploy an sg300-28 in L3 mode as the "core" switch in our ~70-person office, with static routes across 5 vlans. There were probably around 250 devices on the network in total when you include phones, virtual machines, mobile devices, and so on. Over the deployment weekend things worked fantastic; when everyone came in on Monday, network performance was terribly slow.
So my theory at the time was that the switch's (L3) arp cache was full -- if I pinged a host on another vlan, the switch would send a new ARP request every second ping. We scrambled a Linux box to act as a router and disabled the L3 functionality on the switch, and it's been fine since. However, in the months since then, we've observed some STP misconfigurations, which leads me to wonder if it wasn't an ARP table size issue, but rather a topology issue. But moving routing to a different box did solve the problem immediately.
The switch has been fine as our core switch. The MAC table on that switch right now has 358 entries (we've grown since this happened). It was just on level 3 that it wasn't keeping up.
Does this ring a bell? How many arp table entries can an sg300-28 retain?
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May 26, 2013
What is the size of the routing table in the 800 series?
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Nov 29, 2010
When you use Group Policy to determine whether a link is fast or slow, fast links may be incorrectly flagged as slow links.
This problem may occur when a network that you are trying to detect a slow link to is configured to control the size and flow of Internet Control Message Protocol (ICMP) packets. For example, if a router allows for only ICMP ping packets that have a size of 1,024 bytes, the slow-link detection feature may flag the connection as a slow link. This is because the router discards ICMP packets that are larger than 1,024 bytes. If the router discards the packet because it exceeds the allowed size, fast links may be reported as slow links.
According to Microsoft, the default ICMP ping packet size of 2048 is used.Microsoft recommends changing every single Windows machine's ICMP size...but my customer would rather just change the router. It is a 2821 router, running 12.4(24)T4, using MLPPP to bundle two T1s.
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Feb 19, 2013
My comany is planning get full bgp table from our providers we have mutliple egress providers in order to load balance we are looking for a full table from all of them what would be minumu requiremts we have all edges as 6500 with sup 720 ,is there any memory requrements that need to be upgraded ??
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Jun 19, 2011
I've inherited a project building an internet connectivity solution for a large corporate. It has its own AS and its own PI space. They are putting in 100Mbit connections from 5 different Tier1's , taking full internet routing from each. Cisco ASR1002's have already been specified and purchased for the job. I'm not familiar with the ASR platform at all - is it up to the job with full routing tables? multiple instances of full tables ? (not likely to put all 5 into one box!)
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Mar 15, 2013
I have an RV082 10/100 8-Port VPN Router and have configured the NAT table to allow for remote users, however I've run into an issue. It seems like there is a limited number of entries that you can put in the table,10, and I need to configure about 5 more IPs. Any way to expand the NAT table, or alternatively recommend a different router. I would also be willing to add another router to the network, but I have little experience doing that.
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Jun 5, 2012
I want to know that what is the minimum acceptable size of preamble in ethernet frame. if it is less than 7 bytes before sfd begins , will the packet drop?
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Feb 22, 2011
I have an existing site-2-site VPN between a Cisco 2621 router (IOS 12.3) and Cisco 1841 (IOS 12.3) and I can ping packet size of 17000 over the IPSec tunnel without any issue:c2621#ping 192.168.230.254 source f0/1 repeat 20 size 17000,Type escape sequence to abort.Sending 20, 17000-byte ICMP Echos to 192.168.230.254, timeout is 2 seconds:Packet sent with a source address of 192.168.208.254!!!!!!!!!!!!!!!!!!!!Success rate is 100 percent (20/20), round-trip min/avg/max = 144/146/148 msc2621#I replaced the Cisco 2621 with a more powerful ASR 1002 running IOS version asr1000rp1-adventerprisek9.03.01.00.S.150-1.S.bin. However, I can not ping packet size larger than 9200 over the IPSec tunnel:Feb 24 02:42:52.362: %IOSXE-3-PLATFORM: F0: cpp_cp: QFP:00 Thread:015 TS:00000015834854465792 %IPSEC-3-PKT_TOO_BIG: IPSec Packet size 10072 larger than maximum supported size 9216 hence dropping it.Success rate is 0 percent (0/10)asr1002# Why is not working? Basically the more expensive ASR router can not perform the same task as the old Cisco 2621 router.
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Jul 5, 2012
I have a ASA5540 firewall set-up with an interface MTU of 1500.
I suspect that we are receiving packets with a larger MTU but have not found an easy way of confirming this. Any command that can be run on the firewall to display the MTU packet size being received on an interface?
We are also running Solar Winds so could query an OID if such a variable exists.
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Nov 15, 2012
Region : Thailand
Model : TD-W8961ND
Hardware Version : V1
Firmware Version : 2.0.0 Build 111111 Rel.1111
ISP : 3bb
I have a problem when I am trying to add another static ip address to the list
the message above in title pop up, how can I fix it?
DHCP Table is Full!
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Sep 12, 2011
I have a question about filtering incoming bgp route updates from an internet provider. This provider sends the full internet routing table and default route and on an incoming prefix-filter on the customer switch (C6509-sup720) the default route is only accepted.What happens on the 6509 switch when the BGP peer flaps?Does it need to process all the internet routing updates, and if yes probably it cannot handle all these updates?What happens with the CEF table, will the switch install the routes first?
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Nov 9, 2011
i have issues logging into one of our core switches.its a 6509 switch but i cannot log in remotely.when i try to console in on the console port, i cannot log in instead i get the above error message.I haven't rebooted yet but would it solve the problem as this switch is a production switch.
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May 23, 2011
I have a cisco 7204 vxr that terminates a 300 meg ethernet circuit asn well as an mpls DS-3. CPU increases along with utilization of the ethernet circuit. When the utilization gets to around 150 Mbps on the receive, the cpu is maxed out at 100%. I am wondering if the router can support the amount of traffic coming through it. The majority of the traffic is voip using g729 codec, so packet size is small. We are no where close to peak utilization and cpu is at 39%. Here is what I see currently:
#sh verCisco IOS Software, 7200 Software (C7200-ADVIPSERVICESK9-M), Version 12.4(15)T4, RELEASE SOFTWARE (fc2)Technical Support: [URL] 1986-2008 by Cisco Systems, Inc.Compiled Thu 13-Mar-08 10:40 by prod_rel_team
ROM: System Bootstrap, Version 12.3(4r)T3, RELEASE SOFTWARE (fc1)BOOTLDR: 7200 Software (C7200-KBOOT-M), Version 12.3(15), RELEASE SOFTWARE (fc3)
uptime is 3 years, 1 week, 3 days, 6 hours, 40 minutesSystem returned to ROM by Reload CommandSystem restarted at 08:26:49 UTC Wed May 14 2008System image file is "disk2:c7200-advipservicesk9-mz.124-15.T4.bin"
This product contains cryptographic features and is subject to UnitedStates and local country laws governing import, export, transfer anduse. Delivery of Cisco cryptographic products does not implythird-party authority to import, export, distribute or use encryption.Importers, exporters, distributors and users are responsible forcompliance with U.S. and local country laws. By using this product youagree to comply with applicable laws and regulations. If you are unableto comply with U.S. and local laws, return this product immediately.
[code].....
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Dec 19, 2011
We have a cisco 7204 VXR and would like to know the module which has two fastethernet port. We tried a PA-2FEISL-TX but it did not work.
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Mar 6, 2012
Today we got a new cisco 7204 with NPE-G2 , so we wanna to configure to root for the internet so here is my scenerio
1- Public Ip address =155.155.155.20
2 Private Ip Address =192.168.2.0 /24
3- Gateway = 155.155.155.1
4-DNS Server = 194.155.12.133
Interfaces:
1- Gigabite 0/1 - We put this for Public ip address
2- Gigabite 0/2 - and this for Private Ip address
how to route this for the internet . after routed we want our client computers to get internet from Gigabite 0/2 Interface
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May 20, 2012
is 633+ seconds (approximately 10 minutes) load time normal for a Cisco 7204 router? I find that it takes forever for the router to do :Self decompressing the image". I tried the latest IOS and tried different bootloaders but it doesnt seem improve it?
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Feb 28, 2010
We have point to point metro ether net link terminating on 7204VXR router.On this point to point link we are configuring GRE over ip sec. Problem is when the traffic exceeding 8mbps we started getting packet drops. from the Cisco documentation it seems the tunnel bandwidth is by default 8mbps and there is parameter like Inherit/receive but those actually not change the tunnel interface bandwidth.If we just give tunnel bandwidth with bandwidth mentioned it allows me to give option of 100mbps but again the tunnel interface bandwidth remains 8mbpos only and probably that 100mbps is useful only for routing decisions.
i am using advance security 12.4.15T12 image. Whether this is a limitation or any other way to go beyond 8mbps for the tunnel interface (7204VXR-NPEG1 processor)
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May 8, 2011
One of our Routers 7204 rebooted unexpectedly. I try to access Output interpreter but is not working. The output from our router is the following:
WAN-ROUTER#sh version
Cisco IOS Software, 7200 Software (C7200-ADVIPSERVICESK9-M), Version 12.4(15)T2, RELEASE SOFTWARE (fc7)
[Code].....
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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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Nov 8, 2011
I need to route a subnet from a 7204 to 2 different gateway's which are not Cisco based. I cannot use HSRP, GLBP or VRRP as the other 2 gateways don't support theses protocols. Yet they do support OSPF, RIP, and BGP.... Take note that this setup is in a ISP scenario. How can I acheive gateway redundancy?
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Jan 18, 2012
I need to configure BGP on our 7204 and 2811 router. The 7204 is our main router and currently running EIGRP internally. Our remote locations just moved to an MPLS connectivity and they have a 2811 router. I will need to configure BGP for the routing protocol. I have the AS number and the remote AS number. Attached is the the current configuration of the two routers.
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Jan 3, 2011
We have a leased line from one office to a DR site which we use to back up our data. We are using Cisco 7204 and and OC3 circuit. The data is sent in blocks (SRDF) and we are sending changes only. However, we are getting requests from compliance to further secure this connection since it is a leased line. I guess I need to know how secure SRDF traffic is and then if required, how to secure it.
Can we create a simple VPN between the two routers without having to use a VPN concentrator or Firewall? If so, what IOS would be required? How much impact will the VPN have on current bandwidth?
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Dec 22, 2011
We are replacing a DS3 Internet connection with a 100 Mbps fastE connection from a Tier 1 Provider. I currently have a Cisco 7204VXR with 512 Mb DRAM and 128 Mb of Flash and two 10/100 ports that is connected to the DS3. I also have a 3845 with 1 Gb of DRAM and 256 Mb of Flash with two 10/100/1000 ports available.
We are currently running BGP, below is the summary
BGP table version is 88880414, main routing table version 88880414
379041 network entries using 44347797 bytes of memory
379043 path entries using 19710236 bytes of memory(code)
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Nov 28, 2007
I can't seem to find out what this means. Every 6 months or so, my 7204 locks up. I can't even get to it via the console port and I must reboot to access it. I noticed this alarm in my logs.( ASSERT CRITICAL PO1/0 Threshold Cross Alarm - B3) I've looked on-line but can't pinpoint it's meaning. Looks like a flapping interface but might be something else.
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May 11, 2011
My router, a Cisco 7204 with NPE 300, is experiencing output drops and input errors on a fastethernet interface. I have a 100Mbps connection with less than 15Mbps utilization at peak times.
FastEthernet1/0 is up, line protocol is up Hardware is DEC21140, address is 0014.a985.1a1c (bia 0014.a985.1a1c) Internet address is 38.102.66.134/30 MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, reliability 255/255, txload 3/255, rxload 1/255
[Code]....
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Aug 25, 2012
I was planning to buy 7204 VXR for my site's router for the following requirements:
- support for ATM, Serial, ISDN
- support for 3 10/100/1000 ethernet interface
- support for 2 WAN interface
However, I realized that the 7200 series will not be available for sale after September of this year!! Any "reasonable" replacement for 7204 VXR that meets the above requirements?
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Dec 6, 2011
I have a 7204VXR Router, with Neflow. The collection for all interfaces is ok, but one interface (Gigabitethernet 1/0), is not showing the egress traffic in the pictures. The configuration has "ip route-cache flow", ip flow egress, and ip flow ingress set. But, is not showing the egress traffic.
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Oct 24, 2012
I have a Cisco 7204 vxr router that does not have a valid image on the boot flash or on the pcmcia card (disk 2). I tried everything i could to try and get the router to recognize the flash but it keeps giving me a magic card error. I'm losing my mind slowly but surely.
The router boots into Rommon every time and the Rommon options for this router are horrible. No tftpdnld option. Can I get this router to boot from tftp, from Rommon?
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Feb 16, 2012
I have a 7204VXR NPE-400 running c7200-adventerprisek9-mz.124-24.T3.bin at the moment. This device is being used as a firewall between zones in a service provider network.
My issue is we have a lab device on the corporate side that needs to talk SCTP to the core device. Since there is no option to match SCTP in ACLs or protocol matching, I can't really get this to pass properly. What is the new IOS versions support SCTP? Any options to pass this traffic through the firewall?
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Jan 31, 2012
I am preparing to move two branch offices from a point to point T1 connection to Century Link Metro Ethernet.Currently my branch locations connect to my HQ 7204 router via a channelized DS3. I have a 4507R at HQ that I will connect the ME circuit to.We will also be moving our Internet connection on the ME circuit.Our service provider Clink will hand me a single Ethernet handoff for the Internet and branch office connections. For the first phase I will connect one branch office using ME. Once that is in place and tested we will move another office and so on. Then our final step is to move our web connection to the ME circuit.Each branch office has their own unique voice and data subnet. They each have a 2801 router and a 3560 switch. The routers are MGCP gateways with only one PSTN connection, a POTs 911 line on a FXO port.
So my questions are;
1 - Should I connect the ME directly in to the 3560 at the branch offices or use the Fa0/1 on the 2801? Fa0/0 is currently connected to the 3560.
2 - On my 4507R at HQ how will I configure the ME switch port? As a dot1q trunk port?
3 - Given that ME is basically a LAN connection will I have to re IP the branch office? HQ is 10.10.1.x/24. Branch is 10.10.166.x/24 (data) 192.168.166.x/24 (voice).
4 - On the 4507R will I need to configure a vlan interface for each branch subnet?
I attached two network diagrams. One represents our current topology (MEexisting) and the second represents the new ME circuit changes (MEprojected).
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