Re: BGP Load Balancing Question [7:42469]
Looks like you are definately receiving default from your providers. If I remember correctly though your big concern was incoming traffic not outgoing. Like I mentioned in my previous email you need to talk to your providers and find out how they are announcing your address space. For example if your provider A gave with a /26 subnet of a class C to use from their space provider B will not be able to propagate this. If provider A gave you a full class C but are announcing a supernet and provider B is annoucing the /24 porvider B will have the longest match. Dave Jablonski, Michael wrote: Same routes via both connections. this is our border router, no other routing on the inside.. We're probably receiving default routes. BGP router identifier 65.196.X.X, local AS number 7046 BGP table version is 3, main routing table version 3 2 network entries and 2 paths using 242 bytes of memory 1 BGP path attribute entries using 92 bytes of memory BGP activity 2/0 prefixes, 2/0 paths NeighborVAS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 63.122.163.89 4 701 13251 13282300 06:06:32 0 63.122.163.93 4 701 13251 13278300 1w1d 0 I really apprecaite the help I'm getting from everyone! I only hope that I get more exposure, to make studying for the CCNP worth it -Original Message- From: Kane, Christopher A. [mailto:[EMAIL PROTECTED]] Sent: Thursday, April 25, 2002 2:34 PM To: [EMAIL PROTECTED] Subject: RE: BGP Load Balancing Question [7:42469] Inbound/Outbound loads are out of wack what part of the BGP neigh stats do you want to see? I'm referring to simply 'sh ip bgp sum', as this will show the amount of prefixes that you receive on each connection. So if I've read all of the threads correctly, you have 2 T1's at 2 physically separate locations but the same provider. I still have more questions than answers at this point. Are you advertising any routes or the same routes via both connections? (i.e. mail server, ftp server, dns server, etc...) Is there any routing happening on the 'back side', in other words can one router choose to go to the other router rather than out to the net? Looking at your stats from below, you don't have much traffic at all, in either direction. Your loads are low and per packet count (on 5 min moving average) is low. The questions about what routes you are receiving are relevant. Often you have 3 or so options: 1. Receive full-routes (100,000 plus routes) 2. Receive partial routes (i.e. routes for customers that belong to same AS that you get service from) 3. Default route-only. Sorry if it seems I'm dragging you along, but there are several factors to consider when you are attempting to get load-sharing. Especially if you are connected to 2 separate routers on your provider's backbone. -chris This message (including any attachments) is confidential and may be privileged. If you have received it by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change. ABN AMRO Bank N.V. (including its group companies) shall not be responsible nor liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt or damage to your system. ABN AMRO Bank N.V. (or its group companies) does not guarantee that the integrity of this communication has been maintained nor that this communication is free of viruses, interceptions or interference. -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=42665t=42469 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: BGP Load Balancing Question [7:42469]
Check sh ip bgp neigh 63.122.163.89 routes sh ip bgp neigh 63.122.163.89 advertised-routes sh ip bgp neigh 63.122.163.93 routes sh ip bgp neigh 63.122.163.93 advertised-routes If results of both above commands same, then check for following statement in bgp configuration maximum-paths 2 If not check the following page, which will help you troubleshoot further. http://www.cisco.com/warp/customer/459/40.html Hope this helps, Thanks, Jana. -Original Message- From: MADMAN [mailto:[EMAIL PROTECTED]] Sent: Friday, April 26, 2002 11:23 AM To: [EMAIL PROTECTED] Subject: Re: BGP Load Balancing Question [7:42469] Looks like you are definately receiving default from your providers. If I remember correctly though your big concern was incoming traffic not outgoing. Like I mentioned in my previous email you need to talk to your providers and find out how they are announcing your address space. For example if your provider A gave with a /26 subnet of a class C to use from their space provider B will not be able to propagate this. If provider A gave you a full class C but are announcing a supernet and provider B is annoucing the /24 porvider B will have the longest match. Dave Jablonski, Michael wrote: Same routes via both connections. this is our border router, no other routing on the inside.. We're probably receiving default routes. BGP router identifier 65.196.X.X, local AS number 7046 BGP table version is 3, main routing table version 3 2 network entries and 2 paths using 242 bytes of memory 1 BGP path attribute entries using 92 bytes of memory BGP activity 2/0 prefixes, 2/0 paths NeighborVAS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 63.122.163.89 4 701 13251 13282300 06:06:32 0 63.122.163.93 4 701 13251 13278300 1w1d 0 I really apprecaite the help I'm getting from everyone! I only hope that I get more exposure, to make studying for the CCNP worth it -Original Message- From: Kane, Christopher A. [mailto:[EMAIL PROTECTED]] Sent: Thursday, April 25, 2002 2:34 PM To: [EMAIL PROTECTED] Subject: RE: BGP Load Balancing Question [7:42469] Inbound/Outbound loads are out of wack what part of the BGP neigh stats do you want to see? I'm referring to simply 'sh ip bgp sum', as this will show the amount of prefixes that you receive on each connection. So if I've read all of the threads correctly, you have 2 T1's at 2 physically separate locations but the same provider. I still have more questions than answers at this point. Are you advertising any routes or the same routes via both connections? (i.e. mail server, ftp server, dns server, etc...) Is there any routing happening on the 'back side', in other words can one router choose to go to the other router rather than out to the net? Looking at your stats from below, you don't have much traffic at all, in either direction. Your loads are low and per packet count (on 5 min moving average) is low. The questions about what routes you are receiving are relevant. Often you have 3 or so options: 1. Receive full-routes (100,000 plus routes) 2. Receive partial routes (i.e. routes for customers that belong to same AS that you get service from) 3. Default route-only. Sorry if it seems I'm dragging you along, but there are several factors to consider when you are attempting to get load-sharing. Especially if you are connected to 2 separate routers on your provider's backbone. -chris This message (including any attachments) is confidential and may be privileged. If you have received it by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change. ABN AMRO Bank N.V. (including its group companies) shall not be responsible nor liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt or damage to your system. ABN AMRO Bank N.V. (or its group companies) does not guarantee that the integrity of this communication has been maintained nor that this communication is free of viruses, interceptions or interference. -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=42673t=42469 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: BGP Load Balancing Question [7:42469]
I am experiencing a similar problem, using one provider with two T1s. Utilization appears to significantly favor one interface over the other. I realize there will be some variation, but considering its a discrepancy of 75% vs. 3% (these are numbers from our provider) I've talked to the provider; each time I receive a different configuration. Is there a command that would better show the load balancing/utilization rates. I'm trying to become more familiar with BGP through my CCNP studies, but haven't gotten that far yet Thanks in advance for the help! I'm not sure I understand what you are describing. Are you saying that the BGP routes you receive from your provider are mainly coming over one link rather than the other? Or, are you saying that your inbound/outbound loads are uneven? Can you be a little more specific, perhaps, even show some snapshots of the interfaces? And your BGP neigh stats? My first suspicion, (if you are talking about inbound/outbound traffic loads) would be that caching has caused this load disparity. Do you know if CEF was implemented? -chris Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=42530t=42469 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: BGP Load Balancing Question [7:42469]
The Ts are connected to two different routers at different locations The IP space is the providers What do you mean full vs. default/partial routes (Pardon my ignorance; I wish LAN/WAN communications was the only thing to work on)? Thanks for the quick response! -Original Message- From: Lupi, Guy [mailto:[EMAIL PROTECTED]] Sent: Wednesday, April 24, 2002 5:38 PM To: [EMAIL PROTECTED] Subject: RE: BGP Load Balancing Question [7:42469] Are the t1's connected to different routers in the providers POP, or to geographically diverse POP's? Is the IP space your own ARIN assigned space or the providers? Do you take full bgp routes or just a default or partial routes? Any answer would depend on the answers to these questions. As far as seeing the real load balancing, use MRTG to graph the interfaces, that will give you a good idea of how your bandwidth is being utilized. ~-Original Message- ~From: Jablonski, Michael [mailto:[EMAIL PROTECTED]] ~Sent: Wednesday, April 24, 2002 5:49 PM ~To: [EMAIL PROTECTED] ~Subject: BGP Load Balancing Question [7:42469] ~ ~ ~I am experiencing a similar problem, using one provider with two T1s. ~Utilization appears to significantly favor one interface over ~the other. I ~realize there will be some variation, but considering its a ~discrepancy of ~75% vs. 3% (these are numbers from our provider) I've ~talked to the ~provider; each time I receive a different configuration. ~ ~Is there a command that would better show the load ~balancing/utilization ~rates. I'm trying to become more familiar with BGP through my ~CCNP studies, ~but haven't gotten that far yet Thanks in advance for the help! ~ ~ ~ ~Michael Jablonski ~ABN AMRO Asset Management Holdings, Inc. ~161 North Clark St. ~9th Flr ~Chicago, IL 60601-2468 ~PH: 312.884.2996 ~FAX: 312.278.5550 ~ This message (including any attachments) is confidential and may be privileged. If you have received it by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change. ABN AMRO Bank N.V. (including its group companies) shall not be responsible nor liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt or damage to your system. ABN AMRO Bank N.V. (or its group companies) does not guarantee that the integrity of this communication has been maintained nor that this communication is free of viruses, interceptions or interference. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=42541t=42469 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: BGP Load Balancing Question [7:42469]
Inbound/Outbound loads are out of wack what part of the BGP neigh stats do you want to see? Serial0/0 is up, line protocol is up Hardware is QUICC with integrated T1 CSU/DSU Description: To provider1 MTU 1500 bytes, BW 1536 Kbit, DLY 2 usec, rely 255/255, load 5/255 Encapsulation FRAME-RELAY IETF, loopback not set, keepalive set (10 sec) LMI enq sent 77766, LMI stat recvd 77766, LMI upd recvd 0, DTE LMI up LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0 LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE Broadcast queue 0/64, broadcasts sent/dropped 12963/0, interface broadcasts 3 Last input 00:00:04, output 00:00:00, output hang never Last clearing of show interface counters never Queueing strategy: fifo Output queue 0/40, 5642 drops; input queue 0/75, 0 drops 5 minute input rate 181000 bits/sec, 35 packets/sec 5 minute output rate 31000 bits/sec, 8 packets/sec 14791247 packets input, 3209509245 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 1 giants, 0 throttles 15143 input errors, 593 CRC, 8555 frame, 0 overrun, 0 ignored, 5994 abort 6400415 packets output, 2339275311 bytes, 0 underruns 0 output errors, 0 collisions, 8 interface resets 0 output buffer failures, 0 output buffers swapped out 3 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up Serial0/1 is up, line protocol is up Hardware is QUICC with integrated T1 CSU/DSU Description: To provider2 MTU 1500 bytes, BW 1536 Kbit, DLY 2 usec, rely 255/255, load 6/255 Encapsulation FRAME-RELAY IETF, loopback not set, keepalive set (10 sec) LMI enq sent 77769, LMI stat recvd 77768, LMI upd recvd 0, DTE LMI up LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0 LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE Broadcast queue 0/64, broadcasts sent/dropped 12964/0, interface broadcasts 3 Last input 00:00:05, output 00:00:00, output hang never Last clearing of show interface counters never Queueing strategy: fifo Output queue 0/40, 9587 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 38000 bits/sec, 13 packets/sec 183425 packets input, 8800740 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 2893 input errors, 628 CRC, 2175 frame, 0 overrun, 0 ignored, 90 abort 6083912 packets output, 2163859526 bytes, 0 underruns 0 output errors, 0 collisions, 7 interface resets 0 output buffer failures, 0 output buffers swapped out 3 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up -Original Message- From: Kane, Christopher A. [mailto:[EMAIL PROTECTED]] Sent: Thursday, April 25, 2002 7:56 AM To: [EMAIL PROTECTED] Subject: RE: BGP Load Balancing Question [7:42469] I'm not sure I understand what you are describing. Are you saying that the BGP routes you receive from your provider are mainly coming over one link rather than the other? Or, are you saying that your inbound/outbound loads are uneven? Can you be a little more specific, perhaps, even show some snapshots of the interfaces? And your BGP neigh stats? My first suspicion, (if you are talking about inbound/outbound traffic loads) would be that caching has caused this load disparity. Do you know if CEF was implemented? -chris This message (including any attachments) is confidential and may be privileged. If you have received it by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change. ABN AMRO Bank N.V. (including its group companies) shall not be responsible nor liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt or damage to your system. ABN AMRO Bank N.V. (or its group companies) does not guarantee that the integrity of this communication has been maintained nor that this communication is free of viruses, interceptions or interference. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=42554t=42469 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: BGP Load Balancing Question [7:42469]
Do the addresses come from one of the providers and if so is the other provider annoucing this network? If so is this other provider announcing a longer match thereby being prefered? I'm guessing your not getting full routes, partial routes are a providers own networks and those of it's customers. I can't see what you could possibly do to your router config to affect the incoming packets since you don't own the network as path prepending won;t help. Dave Jablonski, Michael wrote: The Ts are connected to two different routers at different locations The IP space is the providers What do you mean full vs. default/partial routes (Pardon my ignorance; I wish LAN/WAN communications was the only thing to work on)? Thanks for the quick response! -Original Message- From: Lupi, Guy [mailto:[EMAIL PROTECTED]] Sent: Wednesday, April 24, 2002 5:38 PM To: [EMAIL PROTECTED] Subject: RE: BGP Load Balancing Question [7:42469] Are the t1's connected to different routers in the providers POP, or to geographically diverse POP's? Is the IP space your own ARIN assigned space or the providers? Do you take full bgp routes or just a default or partial routes? Any answer would depend on the answers to these questions. As far as seeing the real load balancing, use MRTG to graph the interfaces, that will give you a good idea of how your bandwidth is being utilized. ~-Original Message- ~From: Jablonski, Michael [mailto:[EMAIL PROTECTED]] ~Sent: Wednesday, April 24, 2002 5:49 PM ~To: [EMAIL PROTECTED] ~Subject: BGP Load Balancing Question [7:42469] ~ ~ ~I am experiencing a similar problem, using one provider with two T1s. ~Utilization appears to significantly favor one interface over ~the other. I ~realize there will be some variation, but considering its a ~discrepancy of ~75% vs. 3% (these are numbers from our provider) I've ~talked to the ~provider; each time I receive a different configuration. ~ ~Is there a command that would better show the load ~balancing/utilization ~rates. I'm trying to become more familiar with BGP through my ~CCNP studies, ~but haven't gotten that far yet Thanks in advance for the help! ~ ~ ~ ~Michael Jablonski ~ABN AMRO Asset Management Holdings, Inc. ~161 North Clark St. ~9th Flr ~Chicago, IL 60601-2468 ~PH: 312.884.2996 ~FAX: 312.278.5550 ~ This message (including any attachments) is confidential and may be privileged. If you have received it by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change. ABN AMRO Bank N.V. (including its group companies) shall not be responsible nor liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt or damage to your system. ABN AMRO Bank N.V. (or its group companies) does not guarantee that the integrity of this communication has been maintained nor that this communication is free of viruses, interceptions or interference. -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=42562t=42469 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: BGP Load Balancing Question [7:42469]
Inbound/Outbound loads are out of wack what part of the BGP neigh stats do you want to see? I'm referring to simply 'sh ip bgp sum', as this will show the amount of prefixes that you receive on each connection. So if I've read all of the threads correctly, you have 2 T1's at 2 physically separate locations but the same provider. I still have more questions than answers at this point. Are you advertising any routes or the same routes via both connections? (i.e. mail server, ftp server, dns server, etc...) Is there any routing happening on the 'back side', in other words can one router choose to go to the other router rather than out to the net? Looking at your stats from below, you don't have much traffic at all, in either direction. Your loads are low and per packet count (on 5 min moving average) is low. The questions about what routes you are receiving are relevant. Often you have 3 or so options: 1. Receive full-routes (100,000 plus routes) 2. Receive partial routes (i.e. routes for customers that belong to same AS that you get service from) 3. Default route-only. Sorry if it seems I'm dragging you along, but there are several factors to consider when you are attempting to get load-sharing. Especially if you are connected to 2 separate routers on your provider's backbone. -chris Serial0/0 is up, line protocol is up Hardware is QUICC with integrated T1 CSU/DSU Description: To provider1 MTU 1500 bytes, BW 1536 Kbit, DLY 2 usec, rely 255/255, load 5/255 Encapsulation FRAME-RELAY IETF, loopback not set, keepalive set (10 sec) LMI enq sent 77766, LMI stat recvd 77766, LMI upd recvd 0, DTE LMI up LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0 LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE Broadcast queue 0/64, broadcasts sent/dropped 12963/0, interface broadcasts 3 Last input 00:00:04, output 00:00:00, output hang never Last clearing of show interface counters never Queueing strategy: fifo Output queue 0/40, 5642 drops; input queue 0/75, 0 drops 5 minute input rate 181000 bits/sec, 35 packets/sec 5 minute output rate 31000 bits/sec, 8 packets/sec 14791247 packets input, 3209509245 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 1 giants, 0 throttles 15143 input errors, 593 CRC, 8555 frame, 0 overrun, 0 ignored, 5994 abort 6400415 packets output, 2339275311 bytes, 0 underruns 0 output errors, 0 collisions, 8 interface resets 0 output buffer failures, 0 output buffers swapped out 3 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up Serial0/1 is up, line protocol is up Hardware is QUICC with integrated T1 CSU/DSU Description: To provider2 MTU 1500 bytes, BW 1536 Kbit, DLY 2 usec, rely 255/255, load 6/255 Encapsulation FRAME-RELAY IETF, loopback not set, keepalive set (10 sec) LMI enq sent 77769, LMI stat recvd 77768, LMI upd recvd 0, DTE LMI up LMI enq recvd 0, LMI stat sent 0, LMI upd sent 0 LMI DLCI 0 LMI type is ANSI Annex D frame relay DTE Broadcast queue 0/64, broadcasts sent/dropped 12964/0, interface broadcasts 3 Last input 00:00:05, output 00:00:00, output hang never Last clearing of show interface counters never Queueing strategy: fifo Output queue 0/40, 9587 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 38000 bits/sec, 13 packets/sec 183425 packets input, 8800740 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 2893 input errors, 628 CRC, 2175 frame, 0 overrun, 0 ignored, 90 abort 6083912 packets output, 2163859526 bytes, 0 underruns 0 output errors, 0 collisions, 7 interface resets 0 output buffer failures, 0 output buffers swapped out 3 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up -Original Message- From: Kane, Christopher A. [mailto:[EMAIL PROTECTED]] Sent: Thursday, April 25, 2002 7:56 AM To: [EMAIL PROTECTED] Subject: RE: BGP Load Balancing Question [7:42469] I'm not sure I understand what you are describing. Are you saying that the BGP routes you receive from your provider are mainly coming over one link rather than the other? Or, are you saying that your inbound/outbound loads are uneven? Can you be a little more specific, perhaps, even show some snapshots of the interfaces? And your BGP neigh stats? My first suspicion, (if you are talking about inbound/outbound traffic loads) would be that caching has caused this load disparity. Do you know if CEF was implemented? -chris This message (including any attachments) is confidential and may be privileged. If you have received it by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails
RE: BGP Load Balancing Question [7:42469]
Same routes via both connections. this is our border router, no other routing on the inside.. We're probably receiving default routes. BGP router identifier 65.196.X.X, local AS number 7046 BGP table version is 3, main routing table version 3 2 network entries and 2 paths using 242 bytes of memory 1 BGP path attribute entries using 92 bytes of memory BGP activity 2/0 prefixes, 2/0 paths NeighborVAS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 63.122.163.89 4 701 13251 13282300 06:06:320 63.122.163.93 4 701 13251 13278300 1w1d0 I really apprecaite the help I'm getting from everyone! I only hope that I get more exposure, to make studying for the CCNP worth it -Original Message- From: Kane, Christopher A. [mailto:[EMAIL PROTECTED]] Sent: Thursday, April 25, 2002 2:34 PM To: [EMAIL PROTECTED] Subject: RE: BGP Load Balancing Question [7:42469] Inbound/Outbound loads are out of wack what part of the BGP neigh stats do you want to see? I'm referring to simply 'sh ip bgp sum', as this will show the amount of prefixes that you receive on each connection. So if I've read all of the threads correctly, you have 2 T1's at 2 physically separate locations but the same provider. I still have more questions than answers at this point. Are you advertising any routes or the same routes via both connections? (i.e. mail server, ftp server, dns server, etc...) Is there any routing happening on the 'back side', in other words can one router choose to go to the other router rather than out to the net? Looking at your stats from below, you don't have much traffic at all, in either direction. Your loads are low and per packet count (on 5 min moving average) is low. The questions about what routes you are receiving are relevant. Often you have 3 or so options: 1. Receive full-routes (100,000 plus routes) 2. Receive partial routes (i.e. routes for customers that belong to same AS that you get service from) 3. Default route-only. Sorry if it seems I'm dragging you along, but there are several factors to consider when you are attempting to get load-sharing. Especially if you are connected to 2 separate routers on your provider's backbone. -chris This message (including any attachments) is confidential and may be privileged. If you have received it by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this message in whole or in part is strictly prohibited. Please note that e-mails are susceptible to change. ABN AMRO Bank N.V. (including its group companies) shall not be responsible nor liable for the proper and complete transmission of the information contained in this communication nor for any delay in its receipt or damage to your system. ABN AMRO Bank N.V. (or its group companies) does not guarantee that the integrity of this communication has been maintained nor that this communication is free of viruses, interceptions or interference. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=42593t=42469 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: BGP Load Balancing Question [7:42469]
Are the t1's connected to different routers in the providers POP, or to geographically diverse POP's? Is the IP space your own ARIN assigned space or the providers? Do you take full bgp routes or just a default or partial routes? Any answer would depend on the answers to these questions. As far as seeing the real load balancing, use MRTG to graph the interfaces, that will give you a good idea of how your bandwidth is being utilized. ~-Original Message- ~From: Jablonski, Michael [mailto:[EMAIL PROTECTED]] ~Sent: Wednesday, April 24, 2002 5:49 PM ~To: [EMAIL PROTECTED] ~Subject: BGP Load Balancing Question [7:42469] ~ ~ ~I am experiencing a similar problem, using one provider with two T1s. ~Utilization appears to significantly favor one interface over ~the other. I ~realize there will be some variation, but considering its a ~discrepancy of ~75% vs. 3% (these are numbers from our provider) I've ~talked to the ~provider; each time I receive a different configuration. ~ ~Is there a command that would better show the load ~balancing/utilization ~rates. I'm trying to become more familiar with BGP through my ~CCNP studies, ~but haven't gotten that far yet Thanks in advance for the help! ~ ~ ~ ~Michael Jablonski ~ABN AMRO Asset Management Holdings, Inc. ~161 North Clark St. ~9th Flr ~Chicago, IL 60601-2468 ~PH: 312.884.2996 ~FAX: 312.278.5550 ~ ~ ~ ~ ~ ~ ~ ~-Original Message- ~From: Michael Bray [mailto:[EMAIL PROTECTED]] ~Sent: Wednesday, April 24, 2002 2:17 PM ~To: [EMAIL PROTECTED] ~Subject: BGP route selection question [7:42456] ~ ~ ~I have a router that is running BGP to two different providers... When ~I show the bgp entry for two different routes, it shows that one ~provider is selected for one route, and the other provider is selected ~for the other route, even though they seem to have the same AS path ~length from each provider. There isn't any difference as far as I can ~tell for MED or local preference settings or anything like that... ~The route on the bottom looks normal - its being chosen (I assume) ~because the 64.*.*.* has the lower router ID (207.* instead of 208.*). ~The first entry is the one that doesn't make sense to me - shouldn't it ~also be selecting the 64.* router, by virtue of its lower ID? I see ~that there are different values for the version, but I'm not ~sure this ~would have anything to do with it?? ~ ~rtr#show ip bgp 64.170.96.0/19 ~BGP routing table entry for 64.170.96.0/19, version 16127 ~Paths: (2 available, best #2, table Default-IP-Routing-Table) ~ Not advertised to any peer ~ 4323 1239 5673 ~64.132.248.89 from 64.132.248.89 (207.67.76.17) ~ Origin IGP, localpref 100, valid, external ~ 3561 1239 5673 ~208.174.151.61 from 208.174.151.61 (208.172.66.20) ~ Origin IGP, localpref 100, valid, external, best ~ ~rtr#show ip bgp 12.3.59.0 ~BGP routing table entry for 12.3.59.0/24, version 742 ~Paths: (2 available, best #2, table Default-IP-Routing-Table) ~ Not advertised to any peer ~ 3561 4513 17304 ~208.174.151.61 from 208.174.151.61 (208.172.66.20) ~ Origin IGP, localpref 100, valid, external ~ 4323 4513 17304 ~64.132.248.89 from 64.132.248.89 (207.67.76.17) ~ Origin IGP, localpref 100, valid, external, best ~ ~ip classless ~ip route 0.0.0.0 0.0.0.0 208.174.151.61 ~ip route 0.0.0.0 0.0.0.0 64.132.248.89 ~ip as-path access-list 78 permit ^$ ~ ~ ~-Mike Bray ~[EMAIL PROTECTED] ~This message (including any attachments) is confidential and may be ~privileged. If you have received it by mistake please notify ~the sender ~by return e-mail and delete this message from your system. Any ~unauthorized use or dissemination of this message in whole or in part ~is strictly prohibited. Please note that e-mails are susceptible to ~change. ABN AMRO Bank N.V. (including its group companies) ~shall not be ~responsible nor liable for the proper and complete transmission of the ~information contained in this communication nor for any delay in its ~receipt or damage to your system. ABN AMRO Bank N.V. (or its group ~companies) does not guarantee that the integrity of this communication ~has been maintained nor that this communication is free of viruses, ~interceptions or interference. ~--- ~- ~ ~ ~ ~ Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=42473t=42469 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
