Advertise implicit-null label for static routes

Hi, I want to ask if there is any way to change the label or stop adveritise label for an static route. Normally LDP advertises an Implicit Null label for directly connected routes. We want to do similar thing for static routes.
We need to do this is because somehow we need to do rate-limit on the PE interface connecting to the core network instead of the interface connecting to CE. As the incoming packets still got labelled, the rate-limit is skipped. So we want to stop the PE creates label for the static routes or advertises them with implicit null label. Thanks in advance.

Calvin,
Bear in mind that if you only enter the "no mpls ldp advertise-label" command, LDP will stop propagating all labels, which might not ba what you want. If you selectively want to propagate certain labels, then you need to also use "mpls advertise label for " as Shivlu suggested.
Regards,

Similar Messages

  • Implicit-Null Label Value

    Hi,
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    If so, I assume that with MPLS-TE LSPs it's the same thing but with RSVP Resv message...
    Thanks,
    David

    Hello David,
    in fact Label value 3 has the meaning "implicit null". So whatever protocoll is used (LDP or RSVP) this is the signaled value to activate PHP (penultimate hop popping).
    From RFC 3032 section 2.1
    " iv. A value of 3 represents the "Implicit NULL Label". This is a label that an LSR may assign and distribute, but which never actually appears in the encapsulation. When an LSR would otherwise replace the label at the top of the stack with a new label, but the new label is "Implicit NULL", the LSR will pop the stack instead of doing the replacement. Although this value may never appear in the encapsulation, it needs to be specified in the Label Distribution Protocol, so a value is reserved."
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    Martin

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    Technical Support: http://www.cisco.com/techsupport
    Copyright (c) 1986-2010 by Cisco Systems, Inc.
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    Importers, exporters, distributors and users are responsible for
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    Cisco IAD2431 (R527x) processor (revision 4.1) with 250880K/11264K bytes of memory.
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  • Implicit null

    hai experts,
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    Hi,
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    Regards, Martin

  • Implicit null and explicit null

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  • How do you Redistribution EIGRP into OSPF and maintain a distance of 250 for a static route?

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     redistribute eigrp 65100 subnets route-map EIGRP_INTO_OSPF
     passive-interface default
     no passive-interface GigabitEthernet1/0/1
     no passive-interface GigabitEthernet1/0/2
     no passive-interface GigabitEthernet2/0/1
     no passive-interface GigabitEthernet2/0/2
     network 172.18.0.0 0.0.255.255 area 0
    ip prefix-list EIGRP_INTO_OSPF seq 5 permit 172.18.0.0/16 le 32
    ip prefix-list EIGRP_INTO_OSPF seq 10 permit 192.168.94.0/29 le 32
    ip prefix-list EIGRP_INTO_OSPF seq 15 permit 192.168.26.32/29 le 32
    ip prefix-list EIGRP_INTO_OSPF seq 20 permit 192.168.30.72/29 le 32
    ip prefix-list EIGRP_INTO_OSPF seq 25 permit 192.168.20.128/25 le 32
    ip prefix-list EIGRP_INTO_OSPF seq 26 permit 192.168.101.0/24 le 32 <- Backup Route for MPLS Remote Office
    route-map EIGRP_INTO_OSPF permit 10
     match ip address prefix-list EIGRP_INTO_OSPF

    So in the case of a /24. If it were say broken up into /25's? From our remote sites we are using aggregate-address summary-only. Not sure how I would advertise a more specific route via BGP, sorry.
    I didnt have this problem until I moved my firewalls. They plugged into the cores where IBGP was running and the static never kicked in unless the bgp route disappeared. I guess I could use my static redistribution for my VPN sites and use statics across the cores for the handful of backup links I have.

  • OSPF down-bit set for a route originated as static?

    If remote PE is redistributing a static route to VRF, local PE will get this route via BGP. Now suppose this local PE and CE is running OSPF and BGP VPNv4 route is redistributed to OSPF, will this PE set down-bit for type 5 LSAs advertised to CE?
    I am bit confused by RFC-4576, it states that "When a type 3, 5, or 7 LSA is sent from a PE to a CE, the DN bit MUST be set", my understanding is that only if the route is originated from OSPF (at remote PE) then PE will set down-bit in LSAs advertised to CE.

    Niranjan,
    IOS also set the tag to the BGP ASN on external routes as a loop avoidance mechanism as described in RFC 4577, section 4.2.5.2. According to the same RFC, this method has to be supported by default by any compliant implementation for backward compatibility purposes.
    RFC4576: Using a Link State Advertisement (LSA) Options Bit to Prevent Looping in BGP/MPLS IP Virtual Private Networks (VPNs)
    http://www.ietf.org/rfc/rfc4576.txt?number=4576
    RFC4577: OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs)
    http://www.ietf.org/rfc/rfc4577.txt?number=4577
    Regards,

  • Need Help for configuring Floating static route in My ASA.

    Hi All,
    I need your support for doing a floating static route in My ASA.
    I have tried this last time but i was not able to make it. But this time i have to Finish it.
    Please find our network Diagram and configuration of ASA
    route outside 0.0.0.0 0.0.0.0 6.6.6.6 1 track 1
    route outside 0.0.0.0 0.0.0.0 6.6.6.6 1
    route rOutside 0.0.0.0 0.0.0.0 3.3.3.3 10
    route inside 10.10.4.0 255.255.255.0 10.10.3.1 1
    route inside 10.10.8.0 255.255.255.0 10.10.3.1 1
    route inside 10.10.9.0 255.255.255.0 10.10.3.1 1
    route inside 10.10.15.0 255.255.255.0 10.10.3.1 1
    route rOutside x.x.x.x 255.255.255.255 5.5.5.5 1
    timeout xlate 3:00:00
    timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
    timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
    timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
    timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
    timeout tcp-proxy-reassembly 0:01:00
    dynamic-access-policy-record DfltAccessPolicy
    http server enable
    http 10.10.3.77 255.255.255.255 inside
    http 10.10.8.157 255.255.255.255 inside
    http 10.10.3.59 255.255.255.255 inside
    no snmp-server location
    no snmp-server contact
    snmp-server enable traps snmp authentication linkup linkdown coldstart
    sla monitor 123
    type echo protocol ipIcmpEcho 8.8.8.8 interface outside
    num-packets 3
    frequency 10
    sla monitor schedule 123 life forever start-time now
    crypto ipsec transform-set cpa esp-3des esp-md5-hmac
    crypto ipsec security-association lifetime seconds 28800
    crypto ipsec security-association lifetime kilobytes 4608000
    crypto map vpn_cpa 1 match address acl_cpavpn
    crypto map vpn_cpa 1 set peer a.a.a.a
    crypto map vpn_cpa 1 set transform-set abc
    crypto map vpn_cpa 1 set security-association lifetime seconds 3600
    crypto map vpn_cpa interface outside
    crypto isakmp identity address
    crypto isakmp enable outside
    crypto isakmp policy 10
    authentication pre-share
    encryption 3des
    hash md5
    group 2
    lifetime 86400
    crypto isakmp policy 65535
    authentication pre-share
    encryption 3des
    hash sha
    group 2
    lifetime 86400
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    telnet 10.10.3.77 255.255.255.255 inside
    telnet 10.10.8.157 255.255.255.255 inside
    telnet 10.10.3.61 255.255.255.255 inside
    telnet timeout 500
    ssh timeout 5
    console timeout 0
    threat-detection basic-threat
    threat-detection statistics port
    threat-detection statistics protocol
    threat-detection statistics access-list
    no threat-detection statistics tcp-intercept
    ntp server 10.10.3.14
    webvpn
    tunnel-group .a.a.a.a ipsec-attributes
    pre-shared-key *
    class-map inspection_default
    match default-inspection-traffic
    policy-map type inspect dns preset_dns_map
    parameters
      message-length maximum 512
    policy-map global_policy
    class inspection_default
      inspect dns preset_dns_map
      inspect ftp
      inspect h323 h225
      inspect h323 ras
      inspect netbios
      inspect rsh
      inspect rtsp
      inspect skinny 
      inspect esmtp
      inspect sqlnet
      inspect sunrpc
      inspect tftp
    inspect sip 
      inspect xdmcp
    service-policy global_policy global
    smtp-server 10.10.5.11
    prompt hostname context
    Cryptochecksum:eea6e7b6efe5d1a180439658c3912942
    : end
    i think half of the configuration stil there in the ASA.
    Diagram.
    Thanks
    Roopesh

    You have missed the last command in your configuration, Please check it again
    route ISP1  0.0.0.0 0.0.0.0 6.6.6.6 track 1
    route ISP2   0.0.0.0 0.0.0.0 3.3.3.3
    sla monitor 10
    type echo protocol ipIcmpEcho 8.8.8.8 interface ISP1
    num-packets 3
    frequency 10
    sla monitor schedule 123 life forever start-time now
    track 1 rtr 123 reachability
    You can do NAT in same way, here the logical name of the interface will be different.
    Share the result
    Please rate any helpful posts.

  • Is it possible in IOS to have two static routes for the same subnet, one a higher priority and "failover" between the 2?

    Hi All
    Is it possible in IOS to have for a particular subnet:
    a) Two static routes?
    b) Make one static route a higher priority than the other?
    c) If one static router "goes down", failover to the lower priority static route?
    We have a l2tp/vpdn connection to a supplier which can be accessed via two vlans/routes. I would like to make one route the preferred one but the "route" to failover if the preferred route goes down.
    Again, many thanks in advance for all responses!
    Thanks
    John

    Hi John,
    Hope the below explaination will help you...
    R1(config)# ip route 0.0.0.0 0.0.0.0 2.2.2.2
    R1(config)# ip route 0.0.0.0 0.0.0.0 3.3.3.3 10
    If you notice the Administrative Distance for the secondary route pointing to ISP2 is increased to 10 so that it becomes the backup link.
    The above configuration with just two floating static routes partially accomplishes our requirement as it will work only in the scenario where the routers interfaces connected to the WAN link are in up/down or down/down status. But in a lot of situations we see that even though the links remain up but we are not able to reach the gateway, this usually happens when the issue is at the ISP side.
    In such scenarios, IP SLAs becomes an engineer's best friend. With around six additional IOS commands we can have a more reliable automatic failover environment.
    Using IP SLA the Cisco IOS gets the ability to use Internet Control Message Protocol (ICMP) pings to identify when a WAN link goes down at the remote end and hence allows the initiation of a backup connection from an alternative port. The Reliable Static Routing Backup using Object Tracking feature can ensure reliable backup in the case of several catastrophic events, such as Internet circuit failure or peer device failure.
    IP SLA is configured to ping a target, such as a publicly routable IP address or a target inside the corporate network or your next-hop IP on the ISP's router. The pings are routed from the primary interface only. Following a sample configuration of IP SLA to generate icmp ping targeted at the ISP1s next-hop IP.
    R1(config)# ip sla 1
    R1(config)# icmp-echo 2.2.2.2 source-interface FastEthernet0/0
    R1(config)# timeout 1000
    R1(config)# threshold 2
    R1(config)# frequency 3
    R1(config)# ip sla schedule 1 life forever start-time now
    The above configuration defines and starts an IP SLA probe.
    The ICMP Echo probe sends an ICMP Echo packet to next-hop IP 2.2.2.2 every 3 seconds, as defined by the “frequency” parameter.
    Timeout sets the amount of time (in milliseconds) for which the Cisco IOS IP SLAs operation waits for a response from its request packet.
    Threshold sets the rising threshold that generates a reaction event and stores history information for the Cisco IOS IP SLAs operation.
    After defining the IP SLA operation our next step is to define an object that tracks the SLA probe. This can be accomplished by using the IOS Track Object as shown below:
    R1(config)# track 1 ip sla 1 reachability
    The above command will track the state of the IP SLA operation. If there are no ping responses from the next-hop IP the track will go down and it will come up when the ip sla operation starts receiving ping response.
    To verify the track status use the use the “show track” command as shown below:
    R1# show track
    Track 1
    IP SLA 1 reachability
    Reachability is Down
    1 change, last change 00:03:19
    Latest operation return code: Unknown
    The above output shows that the track status is down. Every IP SLAs operation maintains an operation return-code value. This return code is interpreted by the tracking process. The return code may return OK, OverThreshold, and several other return codes.
    Different operations may have different return-code values, so only values common to all operation types are used. The below table shows the track states as per the IP SLA return code.
    Tracking
    Return Code
    Track State
    Reachability
    OK or over threshold
    (all other return codes)
    Up
    Down
    The Last step in the IP SLA Reliable Static Route configuration is to add the “track” statement to the default routes pointing to the ISP routers as shown below:
    R1(config)# ip route 0.0.0.0 0.0.0.0 2.2.2.2 track 1
    R1(config)# ip route 0.0.0.0 0.0.0.0 3.3.3.3 10
    The track number keyword and argument combination specifies that the static route will be installed only if the state of the configured track object is up. Hence if the track status is down the secondary route will be used to forward all the traffic.
    Please rate the helpfull posts.
    Regards,
    Naidu.

  • I´m doing a design for presale, where I will need a router what support PAT for 500 or a little more of users, it not need any more features only static routing and dhcp pool for 500 users, can you help me for know what router recommend?

    I´m doing a design for presale, where  I will  need a router what support PAT for 500 or a little more of users, it  not need any more features only static routing and dhcp pool for 500 users, can you help me for know what router recommend?

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