PBR Using Tracked BGP Route

Hello Guys,
My scenario is:
2 Sites interconnected by 2 MPLS Links and BGP between the routers.
I need some help to force some traffic to be routed using one Link based on Protocol or TCP Port.
But if the link goes down, I need the traffic to be send using another link.
I want to do a PBR using track that validates a specific BGP Route or BGP Neighbor.
Can someone tell me some tips for this case?
Best Regards.
Heleno Fagundes

Hi,
For your two concerns.
**2 Sites interconnected by 2 MPLS Links and BGP between the routers
 Do you have some sort of network diagram ????
**I want to do a PBR using track that validates a specific BGP Route or BGP Neighbor.
We can always apply a track and an IP sla monitoring an IP address which the router is receiving from its BGP peer which you wish to monitor.
I am sure if you provide me sample diagram/config i'll be able to give some more descriptive answer.
Regards,
HK

Similar Messages

  • Do you need a cisco router at remote sites when using VRF BGP?

    Hello.....
    If you could refer to the attached document and read the following... I need to know if a CISCO router is required for each of the sites.   OR does the ISP (Provider) provide the only required Router in the private cloud?
    We want to replace the Cisco 891 with a PepLink but I don't know if we can do that.  Can anyone jump in and help me understand?
    When we hear about VRF, its almost synonymous to MPLS VPN. Virtual Routing and Forwarding is commonly used by Service Providers to provide services within an MPLS cloud with multiple customers. The most interesting feature of this is that, VRF allows creation of multiple routing tables within a single router. This means that overlapping use of IP addresses from different customers is possible. Some enterprises use VRF to seggrate their services like VOIP, wireless, geographical location and other varieties.

    Whether you can replace the 891 device with another device boils down to a single question: Do you need to run BGP with the Service Provider in order to use their service. If you need to run a routing protocol with your service provider, your service is likely a L3VPN (IP VPN) solution ( i.e. you inject your site's routes into the providers L3VPN session, they use MP-BGP+VRF for segmentation within their network).
    If, however, they just drop you a L2 connection and provide L2 emulated services ( e.g. L2VPN or VPLS ) across their network, then your device can be whatever you want it to be.
    From your device's perspective, it is not VRF aware. That is, it does not know about how the service provider segments your service from another customers. In the L3VPN case, your device is routing-protocol aware. In the L2VPN case, your device is not routing protocol aware and does not need to form adjacency with the service provider's equipment.
    HTH.
    Rate if helpful.

  • PBR using multiple ISP's on 6509

    I want to use one ISP for the outgoing traffic for a a specific vlan .if that ISP fails or BGP fails will the outgoing traffic from that vlan takes the other ISP link .

    Mostly the answer to your questions depends on how you have configured PBR.
    In the most simple case where you have just configured PBR and set the next hop, if the router knows that the next hop is not available then it does not do PBR and will just use the default routing. This probably works ok if the next hop is over a point to point serial interface. Otherwise you probably need to get involved with PBR verify-reachabilty (which gets you into IP SLA etc). 
    If the router does recognize that the PBR next hop is not reachable (which may require tracking and IP SPA) then the traffic will just use the normal routing table logic.
    HTH
    Rick

  • PBR Multiple Tracking Support information for Cat2960

                      Hello
    I have been investigating for PBR multiple tracking support devices specially Catalyst 2960.
    The following is very similar to this information. However it can not be applicable to Cat2960.
    [PBR Support for Multiple Tracking Options]
    http://www.cisco.com/en/US/docs/ios/iproute_pi/configuration/guide/iri_prb_mult_track_external_docbase_0900e4b1810fe379_4container_external_docbase_0900e4b181525fed.html#wp1056119
    But feature navigator can show the following information of this feature.
    [Feature Navigator for Cat2960]
    PBR Support for Multiple Tracking Options
    IOS:12.2(55)SE1
    Feature-Set:LAB-Base
    You can find it by using the research feature and filter by PBR.
    So which is correct ?
    Basically Cat2960 can not support PBR or there is any related information based on the feature navigator's info.
    Any information would be very helpful.
    Thank you very much and Best Regards,
    Masanobu Hiyoshi

    Hello Julio
    Thank you for your precious information!
    In my understanding it is conclution that the Catalyst 2960 & 2960S series
    basically do not support for PBR. So PBR multiple tracking also do not support right?
    Here is the output of Cat2960 and 3750X
    2960#sh sdm prefer
    The current template is "lanbase-routing" template.
    The selected template optimizes the resources in
    the switch to support this level of features for
    0 routed interfaces and 255 VLANs.
      number of unicast mac addresses:                        4K
      number of IPv4 IGMP groups + multicast routes:    0.25K
      number of IPv4 unicast routes:                              4.25K
        number of directly-connected IPv4 hosts:             4K
        number of indirect IPv4 routes:                            0.25K
      number of IPv6 multicast groups:                           0.375k
      number of directly-connected IPv6 addresses:        0.75K
      number of indirect IPv6 unicast routes:                  0.5K
      number of IPv4 policy based routing aces:             0
      number of IPv4/MAC qos aces:                            0.125k
      number of IPv4/MAC security aces:                      0.375k
      number of IPv6 policy based routing aces:             0
      number of IPv6 qos aces:                                     0.375k
      number of IPv6 security aces:                              127
    [3750X]
    As you know by default Cat3750X normally requires SDM template as routing for
    functioning PBR. Otherwise the number of IPv4 policy based routing aces
    does not increase.
    3750X(config-if)#ip policy route-map PBR
    Mar 30 01:34:21.869: %PLATFORM_PBR-4-SDM_MISMATCH: PBR requires sdm template routing
    3750X#sh sdm prefer
    The current template is "desktop routing" template.
    The selected template optimizes the resources in
    the switch to support this level of features for
    8 routed interfaces and 1024 VLANs.
      number of unicast mac addresses:                       3K
      number of IPv4 IGMP groups + multicast routes:    1K
      number of IPv4 unicast routes:                             10.875k
        number of directly-connected IPv4 hosts:           3K
        number of indirect IPv4 routes:                          7.875k
      number of IPv6 multicast groups:                        64
      number of directly-connected IPv6 addresses:      0
      number of indirect IPv6 unicast routes:                32
      number of IPv4 policy based routing aces:          0.5K
      number of IPv4/MAC qos aces:                          0.375k
      number of IPv4/MAC security aces:                   0.875k
      number of IPv6 policy based routing aces:          0
      number of IPv6 qos aces:                                  0
      number of IPv6 security aces:                           58
    So what could you think about the feature navigator's information related to this?
    Is it possible to modify it? or request to cisco for this?
    Best Regards,
    Masanobu Hiyoshi

  • EIGRP vs BGP route path selection scenario

    I am looking for a routing solution to the following scenario.  It is a fairly simple design. 
    I have two WAN connections between sites A and B.  One is a 20 Meg Metro Ethernet Circuit running EIGRP.  The other is a 10 Meg MPLS running BGP.  What do I need to do in my configuration to make sure that the 20 Meg connection is the chosen path based off the fact that it has better speed and bandwidth?  It appears to me that the MPLS is the preferred path even though it is slower.
    See attached Diagram:
    Site A Config
    interface GigabitEthernet1/0/12
     description PADC COX P2P 20 Meg
     no switchport
     bandwidth 20480
     ip address 172.20.1.1 255.255.255.252
    interface GigabitEthernet2/0/2
     description LEVEL 3 MPLS
     no switchport
     bandwidth 10240
     ip address 172.22.0.2 255.255.255.252
    router eigrp 1
     network 10.0.1.0 0.0.0.255
     network 172.20.1.0 0.0.0.3
     network 192.168.76.8 0.0.0.3
      redistribute bgp 65003 metric 100 1 255 1 1500 route-map MPLS_NETWORKS
     redistribute static route-map DEFAULT_ROUTE
    router bgp 65003
     bgp log-neighbor-changes
     redistribute static
     redistribute eigrp 1
     neighbor 172.22.0.1 remote-as 1
     default-information originate
    Site B Config
    interface GigabitEthernet0/1
     description COX Communications 10 Meg to Venyu
     bandwidth 20480
     ip address 172.20.1.2 255.255.255.252
     duplex auto
     speed auto
     service-policy output VOIP
    interface GigabitEthernet0/2
     description Level 3 MPLS
     bandwidth 10240
     ip address 172.22.1.2 255.255.255.252
     duplex full
     speed 100
    router eigrp 1
     network 10.3.1.0 0.0.0.31
     network 10.52.1.0 0.0.0.255
     network 10.76.6.0 0.0.0.255
     network 172.20.1.0 0.0.0.3
     network 192.168.63.64 0.0.0.63
     network 192.168.76.249 0.0.0.0
     passive-interface default
     no passive-interface GigabitEthernet0/0
     no passive-interface GigabitEthernet0/1
    router bgp 65003
     bgp log-neighbor-changes
     network 10.3.1.0 mask 255.255.255.224
     network 10.52.1.0 mask 255.255.255.0
     network 10.76.6.0 mask 255.255.255.0
     network 192.168.76.249 mask 255.255.255.255
     neighbor 172.22.1.1 remote-as 1

    If each router is receiving advertisements for the same networks/subnet masks from both BGP and EIGRP it will always choose the BGP routes because they have a lower AD ie. 20 vs EIGRP 90.
    Doesn't matter what the bandwidth is.
    If you want to prefer the 20Mbps links then there are a number of options -
    1) if you can summarise each sites subnets then advertise the summary via BGP and the more specific via EIGRP.  More specific will be chosen even before AD is taken into account.
    2) change the AD of either BGP or EIGRP so EIGRP ends up with the lower AD
    3) run BGP on both links although you would still need to manipulate the attributes to make sure the link you want is used.
    Jon

  • LMS 4.2 User tracking and router arp table

    Hi,
    If I have understand correctly, the IP address - mac address matching was made with the arp table of a cisco acces switch if it will made the L3.
    My access switch wasn't used for L3 routing, only L2
    It's possible to set user track to use the arp table of a firewall or a router for made this matching ?
    Thanks a lot

    As long as you have a supported Cisco Layer 3 device in your LMS-management domain, you should be able to correlate the IP-MAC addresses in User Tracking (UT).
    UT support is not specifically listed for the ASA firewall - I'm not sure it will support that feature if it is the users' gateway.
    Useful links:
    UT explanation from the LMS Admin Guide
    Supported devices listing
    Hope this helps.

  • Monitoring a BGP route and AS-PATH.

    Hello.
    I need to receive a SNMP trap when a BGP route, received with a specific AS-PATH, disappears from routing table.
    Any ideas?
    Thanks.
    Andrea

    You can use EEM for this. Check out the cisco beyond web site for sample scripts that may help you do this.
    A company that I used to work for, www.magnus.net had a mature EEM solution for doing this for large network environments. They took a standalone router and using EEM turned it into a route monitor.  It would send out notifications when BGP routes of defined attributes like AS-Path diasappeared from routing tables.  It was driven by an excel spreadsheet as inputs. It was written by a super CCIE engineer.

  • BGP router id change

    Hi,
    I would like to change the bgp router id on my router that dialogue with peers in other AS.
    I will use the loopback interface 0 and I have a doubt about the ip address that I can use.
    I think that can be a private address in a public addresses domain. Is it correct?
    So, I think that it's better I'd implement the ebgp multihop command with the remote AS peers. Right?
    Before I do these changes do I have to warn the other peers to permit to change their configuration?

    Hello,
    Changing your router-id will be effective after you reset your connections.
    You can use a RFC 1918 address to suit your needs. Be careful not to leak the address to the Internet.
    If you use the Loopback interface as a update-source you need to use the ebgp-multihop command for reachability. If you are useing it for a router-id only you should not bother to change the TTL in BGP packets.
    It is recommended that you inform your peers about your plans.
    HTH
    Leon
    * Please rate posts.

  • BGP Router high process

    What do we need to do if BGP Router contribute high process in CPU?
    CPU utilization for five seconds: 97%/43%; one minute: 99%; five minutes: 92%
     PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process 
      44    36270732  35464661       1022 25.03% 15.21% 14.43%   0 BGP Router       
     325   7703860203228294256          0 10.47%  5.58%  5.24%   0 IP Input         
     455     7596596  28244228        268  5.59%  1.60%  0.82%   0 BGP I/O          
     543    13576608   8569950       1584  3.83% 18.94%  9.57%   0 BGP Task         
       9   152474380  15201602      10030  2.07%  0.27%  0.57%   0 Check heaps      
     376    16372652   7777145       2105  1.83% 13.93% 13.76%   0 IP RIB Update    
     358    56785192  14452691       3929  0.95%  0.44%  0.52%   0 CEF: IPv4 proces 
      23    55656604 116191071        479  0.71%  0.51%  0.50%   0 ARP Input        
     348     5736736   7812055        734  0.63%  4.19%  5.03%   0 XDR mcast        
     546    36531108 132425650        275  0.63%  0.37%  0.28%   0 Port manager per 
      35    56337684 306101724        184  0.23%  0.42%  0.30%   0 IPC Seat Manager 
     330   287962916 871459868        330  0.23%  0.39%  1.61%   0 SNMP ENGINE      
     286      7682841067821917          0  0.15%  0.07%  0.07%   0 Ethernet Msec Ti 
     626      354112    825565        428  0.15%  0.11%  0.09%   0 IPv6 Input       
       3      754316 523105917          1  0.15%  0.10%  0.09%   0 HSRP Common      
     385     2182508  14151135        154  0.15%  0.10%  0.14%   0 L3 Manager       
     317    44655884 658073408         67  0.07%  0.04%  0.21%   0 PDU DISPATCHER   
     395     4363480   4661440        936  0.07%  0.04%  0.05%   0 HIDDEN VLAN Proc 
     323     1161648 134374319          8  0.07%  0.04%  0.05%   0 VRRS Main thread 
      56     2269676   9230664        245  0.07%  0.08%  0.07%   0 Per-Second Jobs  
     240     1449416   1870109        775  0.07%  0.04%  0.05%   0 Compute load avg 
     243   1488814081309230003        113  0.07%  0.13%  0.76%   0 IP SNMP          
    CPU utilization for five seconds: 97%/43%; one minute: 99%; five minutes: 92%
     PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process 
      44    36270732  35464661       1022 25.03% 15.21% 14.43%   0 BGP Router       
     325   7703860203228294256          0 10.47%  5.58%  5.24%   0 IP Input         
     455     7596596  28244228        268  5.59%  1.60%  0.82%   0 BGP I/O          
     543    13576608   8569950       1584  3.83% 18.94%  9.57%   0 BGP Task         
       9   152474380  15201602      10030  2.07%  0.27%  0.57%   0 Check heaps      
     376    16372652   7777145       2105  1.83% 13.93% 13.76%   0 IP RIB Update    
     358    56785192  14452691       3929  0.95%  0.44%  0.52%   0 CEF: IPv4 proces 
      23    55656604 116191071        479  0.71%  0.51%  0.50%   0 ARP Input        
     348     5736736   7812055        734  0.63%  4.19%  5.03%   0 XDR mcast        
     546    36531108 132425650        275  0.63%  0.37%  0.28%   0 Port manager per 
      35    56337684 306101724        184  0.23%  0.42%  0.30%   0 IPC Seat Manager 
     330   287962916 871459868        330  0.23%  0.39%  1.61%   0 SNMP ENGINE      
     286      7682841067821917          0  0.15%  0.07%  0.07%   0 Ethernet Msec Ti 
     626      354112    825565        428  0.15%  0.11%  0.09%   0 IPv6 Input       
       3      754316 523105917          1  0.15%  0.10%  0.09%   0 HSRP Common      
     385     2182508  14151135        154  0.15%  0.10%  0.14%   0 L3 Manager       
     317    44655884 658073408         67  0.07%  0.04%  0.21%   0 PDU DISPATCHER   
     395     4363480   4661440        936  0.07%  0.04%  0.05%   0 HIDDEN VLAN Proc 
     323     1161648 134374319          8  0.07%  0.04%  0.05%   0 VRRS Main thread 
      56     2269676   9230664        245  0.07%  0.08%  0.07%   0 Per-Second Jobs  
     240     1449416   1870109        775  0.07%  0.04%  0.05%   0 Compute load avg 
     243   1488814081309230003        113  0.07%  0.13%  0.76%   0 IP SNMP          

    Hi,
    BGP Router process is in charge to determine the best path and processes any route "churn". It also sends and receives routes, establishes peers, and interacts with the routing information base (RIB).
    (http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/107615-highcpu-bgp.html)
    So I suggest to check what make this process working hard. Depending on that you can choose what to do: bgp dampening (if you have many changes in advertisement received form a neighbor), tuning timer (if neighbor is flapping), using peer-group / update-groups to reduce the amount of job your BGP process has to do to process updates etc...
    Have a look here: https://supportforums.cisco.com/discussion/11604471/high-cpu-usage-bgp-router-process
    Bye,
    enrico
    PS please rate if useful

  • Dual homed bgp route perference help

    Good Morning, sir
    I have a question regarding bgp route preference. 
    We have multi-homed BGP on remote site. 
    Let's call this site , site_a has verizon and at&t MPLS connection using bgp. 
    Currently, at&t route is preferred using as path prepend method. 
    We have addition AS number prepended on link to Verizon to prefer at&t route. 
    At this time, verizon is idle and not being used. 
    We would like to utilize this network to pass backup traffic. 
    We have source and destination address that we would like to pass through Verizon (out backup) link. 
    Any idea how I can do this? 
    I created the source/destination with ACL and created route-map matching that ACL and tweaked the local preference. 
    and since only major route is listed under 'show ip bgp' and not the specific route which I would like to influence, 
    I didn't see the tweaked route on routing table. 
    Any idea, anyone? 
    Thanks

    Getting the specific route into the routing depends on what is there ie. -
    if there is already a route with same prefix and subnet mask in your IP routing table then you are fine.
    If there isn't and your routing table does not have even more specific routes covering the whole subnet you want to advertise then you could use a static route either pointing to the next hop IP or the interface on the router used to get to that subnet.
    Then you can use a "network ..." statement under your BGP configuration to advertise it and use a route map to only advertise it down the backup link.
    Jon

  • How to establish BGP Neighbourship without receiving BGP routes ?

    Hi All,
    I would like to establish BGP Neighbourship between my internet router and ISP router.
    However I would not like my internet router to receive millions of bgp routes from the ISP router but my inside users should access internet via my internet router.
    Kindly suggest how to do it.
    Regards,
    Mitesh Manwatkar.

    Disclaimer
    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
    Liability Disclaimer
    In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
    Posting
    Also depending on you setup with your ISP, you might not need BGP at all.  Sometimes the ISP will advertize your public IP space (i.e. you don't need to), and if they do, all you need is a default route out.
    PS:
    Also BTW, often for basic ISP connectivity, even when BGP peering with your ISP, the ISP will not send you any routes but a default (because with a single link, there's no need for them).

  • Trouble getting BGP route to be primary

    We have an MPLS network between locations using BGP. Several locations have a VPN connection as a backup and use OSPF for those routes.
    When an MPLS link goes down, the traffic switches over to the VPN connection just fine. But when the MPLS link comes back up, the OSPF route is still overriding the BGP route.  I've changed the weights for both BGP & OSPF but still can't get the BGP route to override the OSPF route.
    Any ideas as to what I'm missing?
    Main router, MPLS link active at remote site:
    nbrtr2#sh ip bgp
    BGP table version is 6837, local router ID is 216.149.85.242
    Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
                  r RIB-failure, S Stale
    Origin codes: i - IGP, e - EGP, ? - incomplete
       Network          Next Hop            Metric LocPrf Weight Path
    *> 172.16.104.0/24  216.149.85.241                       300 2828 3549 2828 i
    nbrtr2#sh ip bgp 172.16.104.0
    BGP routing table entry for 172.16.104.0/24, version 6839
    Paths: (1 available, best #1, table Default-IP-Routing-Table)
    Flag: 0x820
      Not advertised to any peer
      2828 3549 2828
        216.149.85.241 from 216.149.85.241 (216.149.85.241)
          Origin IGP, localpref 100, weight 300, valid, external, best
    After shutting down the remote interface, traffic switches to the VPN link.
    nbrtr2#sh ip bgp
    BGP table version is 6842, local router ID is 216.149.85.242
    Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
                  r RIB-failure, S Stale
    Origin codes: i - IGP, e - EGP, ? - incomplete
       Network          Next Hop            Metric LocPrf Weight Path
    *> 172.16.104.0/24  172.16.196.4           123           100 ?
    nbrtr2#sh ip bgp 172.16.104.0
    BGP routing table entry for 172.16.104.0/24, version 6842
    Paths: (1 available, best #1, table Default-IP-Routing-Table)
    Flag: 0x820
      Advertised to update-groups:
            1
      Local
        172.16.196.4 from 0.0.0.0 (216.149.85.242)
          Origin incomplete, metric 123, localpref 100, weight 100, valid, sourced,
    best
    Bringing up the remote interface, the traffic stays on the VPN.
    nbrtr2#sh ip bgp
    BGP table version is 6843, local router ID is 216.149.85.242
    Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
                  r RIB-failure, S Stale
    Origin codes: i - IGP, e - EGP, ? - incomplete
       Network          Next Hop            Metric LocPrf Weight Path
    *> 172.16.104.0/24  172.16.196.4           123           100 ?
    nbrtr2#sh ip bgp 172.16.104.0
    BGP routing table entry for 172.16.104.0/24, version 6842
    Paths: (1 available, best #1, table Default-IP-Routing-Table)
      Advertised to update-groups:
            1
      Local
        172.16.196.4 from 0.0.0.0 (216.149.85.242)
          Origin incomplete, metric 123, localpref 100, weight 100, valid, sourced,
    best
    Finally, terminating the site-site VPN tunnel restores the MPLS route:
    nbrtr2#sh ip bgp
    BGP table version is 6845, local router ID is 216.149.85.242
    Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
                  r RIB-failure, S Stale
    Origin codes: i - IGP, e - EGP, ? - incomplete
       Network          Next Hop            Metric LocPrf Weight Path
    *> 172.16.104.0/24  216.149.85.241                       300 2828 3549 2828 i
    nbrtr2#sh ip bgp 172.16.104.0
    BGP routing table entry for 172.16.104.0/24, version 6845
    Paths: (1 available, best #1, table Default-IP-Routing-Table)
    Flag: 0x820
      Not advertised to any peer
      2828 3549 2828
        216.149.85.241 from 216.149.85.241 (216.149.85.241)
          Origin IGP, localpref 100, weight 300, valid, external, best
    Config details:
    router ospf 100
     log-adjacency-changes
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