06-30-2008 10:00 PM - edited 03-05-2019 11:55 PM
Hello.
By using "debug glbp events" can see something like the following
output.
===============================================
GLBP: Fa0/0 123.1 Listen: k/Hello rcvd from lower pri Active router (135/211.102.108.161)
===============================================
or
===============================================
GLBP: Fa0/0 123.1 Active: i/Hello rcvd from higher pri Active router (167/211.102.108.152)
===============================================
Note the (xyz / ip_addr)
Is the "xyz" prior to "ip_addr" the priority of the virtual forwarder?
I wonder how this number "xyz" be calculated by router.
Who knows, please?
Thank you.
07-01-2008 02:50 AM
Hi,
It's not the priority of GLBP which we configured.
I am not sure about 135 or 167 here but what I observed in the labs is...
It says "167" when Primary VF is active & says "135" when Primary VG is inactive.
Pls find the following link which may help...
Regards...
-Ashok.
07-01-2008 02:55 AM
hi,
xyz is calculated in Weighted Load Balancing Algorithm.
It can be as simple as adding all the weight defined and the sum total will be the xyz.
regards,
pravin
07-01-2008 06:29 AM
Pravin,
I don't think this could be sum of all weights as per debugs.
Pls find the conf & debugs here.
PE-1#sh run | in glbp
glbp 1 ip 20.1.1.10
glbp 1 priority 200
glbp 1 weighting 200
glbp 1 load-balancing weighted
PE-1#debug glbp packets
GLBP Packets debugging is on
PE-1#un all
*Mar 1 00:04:58.831: GLBP: Fa0/0 Grp 1 Hello out VG Active pri 200 vIP 20.1.1
.10 hello 3000, hold 10000 VF 1 Active pri 167 vMAC 0007.b400.0101
*Mar 1 00:04:59.811: GLBP: Fa0/0 Grp 1 Hello in VG Standby pri 50 vIP 20.1.1.
10 hello 3000, hold 10000 VF 2 Active pri 167 vMAC 0007.b400.0102
All possible debugging has been turned off
PE-1#
-------------------------------------------------
PE-2#sh run | in glbp
*Mar 1 00:23:43.679: %SYS-5-CONFIG_I: Configured from console by console
glbp 1 ip 20.1.1.10
glbp 1 priority 50
glbp 1 weighting 150
glbp 1 load-balancing weighted
PE-2#
*Mar 1 00:04:26.279: GLBP: Fa0/0 Grp 1 Hello in VG Active pri 200 vIP 20.1
.10 hello 3000, hold 10000 VF 1 Active pri 167 vMAC 0007.b400.0101
*Mar 1 00:04:27.115: GLBP: Fa0/0 Grp 1 Hello out VG Standby pri 50 vIP 20.1.
10 hello 3000, hold 10000 VF 2 Active pri 167 vMAC 0007.b400.0102
Irrespective of weight configuration, it's giving 167 as Pri.
Regards...
-Ashok.
07-01-2008 07:55 AM
Hi Ashok,
I meant to say that weight algorithm is been used by cisco. This does not have any rfc to prove and calculate.
Weighted allows for GLBP to place a weight on each device when calculating the amount of load sharing. For example, if there are two routers in the group, and router A has twice the forwarding capacity of router B, the weighting value should be configured to be double the amount of router B. To assign a weighting value, the glbp x weighting y, where x is the GLBP group number, and y is the weighting value, a number from 1 to 254.
It would be great if some one can come up with and answer
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