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2837 Views 7 Replies Latest reply: Apr 11, 2014 4:13 PM by Alex RSS

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(EIGRP) Bandwidth Percent - verification?

Jun 16, 2011 7:35 PM

Alex Presse 68 posts since
Nov 25, 2008

Here's my really slick configuration:

 

 

interface Serial1/0

bandwidth 192

no ip address

ip bandwidth-percent eigrp 15 17

encapsulation frame-relay

serial restart-delay 0

!

interface Serial1/0.1 point-to-point

bandwidth 128

ip address 193.10.25.10 255.255.255.0

ip authentication mode eigrp 15 md5

ip authentication key-chain eigrp 15 EIGRPLAB

frame-relay interface-dlci 101  

!

interface Serial1/0.2 point-to-point

bandwidth 64

ip address 193.10.26.10 255.255.255.0

ip authentication mode eigrp 15 md5

ip authentication key-chain eigrp 15 EIGRPLAB

frame-relay interface-dlci 201  

 

 

I've tried googling this a bit, but does anybody know if there is a way to verify how much bandwidth EIGRP is allowed to take per (sub)interface?

In my example above, I want EIGRP to be limited at each sub-interface to 32kbps which is about 17% of 192. So can I configure the bandwidth-percent on the parent interface or should I be configuring it at each sub-interface? (I know I SHOULD configure it at each sub-interface, but what will happen with what I have configured above?)

 

Many thanks guys and gals!

  • Brian 2,971 posts since
    Aug 17, 2009
    Currently Being Moderated
    1. Jun 16, 2011 8:26 PM (in response to Alex Presse)
    Re: (EIGRP) Bandwidth Percent - verification?

    Aloha Alex,

     

    With EIGRP over FR you want to make sure you configure the bandwidth correctly to avoid possible loss to EIGRP packets.  There three basic rules:

     

    1. EIGRP traffic should not be allowed to exceed the capacity of the VC.
    2. The total EIGRP traffic for all VCs should not exceed the access line rate of the interface.
    3. the bandwidth allowed for EIGRP should be the same on both sides of the link.

     

    In P2P connections, you have maximum control over the bandwidth and is the best configuration if the VCs have different bandwidths.  So, you should configure the bandwidth and the EIGRP "bandwidth-percent" for each P2P link directly under the subinterface rather than the main interface.

     

    Reference: Document ID: 13672, "Configuration Notes for the Implementation of EIGRP over Frame Relay and Low Speed Links"

     

    HTH

     

    Message was edited by: Brian

  • Keith Barker - CCIE RS/Security, CISSP 5,351 posts since
    Jul 3, 2009
    Currently Being Moderated
    2. Jun 16, 2011 8:13 PM (in response to Alex Presse)
    Re: (EIGRP) Bandwidth Percent - verification?

    small  Wan tshoot with dlci and IPs.jpg

     

    R1(config-if)#do show ip eigrp int

    IP-EIGRP interfaces for process 1

     

                            Xmit Queue   Mean   Pacing Time   Multicast    Pending

    Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes

    Lo0                0        0/0         0       0/1            0           0

    Fa0/0              1        0/0        19       0/2           92           0

    Se0/0              1        0/0        10      64/2432      2480           0

    Se0/1              1        0/0        18       0/15          91           0

    Se0/2              2        0/0       224      64/2432      6236           0

    Se0/2.6            1        0/0       231       0/15        1423           0

    Se0/2.7            1        0/0        22       0/15         143           0

     

    Modify bandwidth-percent for ser0/2:

     

    R1(config-if)#ip bandwidth-percent eigrp 1 1

    R1(config-if)#do show ip eigrp int         

    IP-EIGRP interfaces for process 1

     

                            Xmit Queue   Mean   Pacing Time   Multicast    Pending

    Interface        Peers  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes

    Lo0                0        0/0         0       0/1            0           0

    Fa0/0              1        0/0        19       0/2           92           0

    Se0/0              1        0/0        10      64/2432      2480           0

    Se0/1              1        0/0        18       0/15          91           0

    Se0/2              2        0/0       224    3200/121600    6236           0

    Se0/2.6            1        0/0       231       0/15        1423           0

    Se0/2.7            1        0/0        22       0/15         143           0

     

    At least for the pacing time, there is a change, due to the configuration, but the change isn't reflected for the sub interfaces.

     

    It doesn't look like it trickles down.

     

    I am open to other input.

     

    Keith

     

    Here is a Frame Relay/WAN troubleshooting video, based on the above topology.

     

    best viewed full screen, using hd 720p option

  • Brian 2,971 posts since
    Aug 17, 2009
    Currently Being Moderated
    4. Jun 16, 2011 8:28 PM (in response to Alex Presse)
    Re: (EIGRP) Bandwidth Percent - verification?

    Yes, thank you.  I will fix the post.

     

    The default is 50% of the bandwidth.  So, if you configure the "bandwidth-percent" to 17% and the subinterface is set for 64k as you have done, then you can be assured that EIGRP will not use more than 10k or 11k (64k *.17 = 10.88).  I do not know of any command off the top of my head that will show what is used.  I would have to do a quick lab and see.

     

    HTH

  • NuklearKrisis - CCNA 74 posts since
    Nov 3, 2012
    Currently Being Moderated
    6. Feb 23, 2014 10:07 AM (in response to Alex Presse)
    Re: (EIGRP) Bandwidth Percent - verification?

    WOW Keith Barker might answer your question on this forum!!! NO WAY!! That is INSANE!

     

    Keith Barker is the ultimate master of IT...he knows everything. 

  • Alex 1 posts since
    May 11, 2013
    Currently Being Moderated
    7. Apr 11, 2014 4:13 PM (in response to Alex Presse)
    Re: (EIGRP) Bandwidth Percent - verification?

    interface Ethernet0/0.35

    encapsulation dot1Q 35

    ip address 172.16.35.3 255.255.252.0

    ip bandwidth-percent eigrp 35 25

    ip summary-address eigrp 35 172.16.0.0 255.255.0.0

    ip ospf 123 area 3

    end

     

    R3#sh ip eigrp int det

    EIGRP-IPv4 Interfaces for AS(35)

                                  Xmit Queue   PeerQ        Mean   Pacing Time   Multicast    Pending

    Interface              Peers  Un/Reliable  Un/Reliable  SRTT   Un/Reliable   Flow Timer   Routes

    Et0/0.35                 1        0/0       0/0           6       0/5           50           0

      Hello-interval is 5, Hold-time is 15

      Split-horizon is enabled

      Next xmit serial <none>

      Packetized sent/expedited: 9/2

      Hello's sent/expedited: 285/2

      Un/reliable mcasts: 0/6  Un/reliable ucasts: 8/4

      Mcast exceptions: 1  CR packets: 1  ACKs suppressed: 0

      Retransmissions sent: 0  Out-of-sequence rcvd: 0

      Topology-ids on interface - 0

      Interface BW percentage is 25

      Authentication mode is not set

     

    That's the fastest way to see the currently configured percentage, then the calc is simple

     

    R3#sh int Et0/0.35 | i BW

      MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,

     

    25% x 10000 = 2500 Kbps

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