eigrp update, bandwidth ,delay

[sarahr202]

Hi everybody.

I am getting a little different result than expected in the following example.

|--------f0/0--R1-----s0/0-------------------R2

R1 config :

f0/0  10.10.10.1/8

s0/0   199.199.199.1/24

eigrp 1

network 10.0.0.0

network 199.199.199.0

When R1 sends update about 10.0.0.0/8 to R2 , it should contain bandwidth as 100,000 ( Kb), delay 100  ( 10 tens of microsecond) with f0/0 default values:

bandwidth  100Mbs

Delay on f0/0 1000 u sec

However When I performed the packet capture of the update I found following:

No.     Time        Source                Destination           Protocol Length Info
     43 84.489000   199.199.199.1         199.199.199.2         EIGRP    70     Update

Frame 43: 70 bytes on wire (560 bits), 70 bytes captured (560 bits)
Cisco HDLC
Internet Protocol Version 4, Src: 199.199.199.1 (199.199.199.1), Dst: 199.199.199.2 (199.199.199.2)
Cisco EIGRP
    Version: 2
    Opcode: Update (1)
    Checksum: 0xcdbe
    Flags: 0x00000008
    Sequence: 3
    Acknowledge: 2
    Autonomous System: 1
    IP internal route  =   10.0.0.0/8
        Type: IP internal route (258)
        Size: 26
        Next Hop: 0.0.0.0 (0.0.0.0)
        Delay: 25600
       Bandwidth: 256000
        MTU: 1500
        Hop Count: 0
        Reliability: 255
        Load: 1
        Reserved: 0
        Prefix Length: 8
        Destination: 10.0.0.0

I appreciate your help.

[Raju Sekharan · Accepted solution]

Hi

• bandwidth = (10000000/bandwidth(i)) * 256

  where bandwidth(i) is the least bandwidth of all outgoing interfaces           on the route to the destination network represented in           kilobits.

EIGRP uses the following formula to scale the delay:

• delay = delay(i) * 256

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094cb7.shtml

Thanks

Raju