GLBP.

examples20001 · ‎12-07-2005

Hi Experts,

I am testing the GLBP with two 1841, ios 12.4(3a) ADVSEC-K9-M image. The GLBP is configured at the LAN side interface (fa0/0) of both the router. I setup a pc with ip and gateway as vip of router.

Now I tried ping to my ISP router A.B.C.17 from the pc, it works fine.

Now I removed the link from the router and ping gave time out for so many mins. After some mins, the ping reply started.

I tested for so many times this and saw that the change over between the router is happening at different times (mins). Link 2 mins, 4 mins, 5 mins, 6 mins ....in different tests.

Is this a normal procedure, if so how to reduce the timing to a fast recovery of link?

I have attached the config details and GLBP details of both routers.

examples20001 · ‎12-08-2005

Hi

After changing the weighting lower threshold value like below, the traffic change over between the routers takes only 45sec.

glbp 10 weighting 100 lower 95 <========= Added

http://www.cisco.com/en/US/products/ps6600/prod_presentation0900aecd801790a3.html

Test-A#

!

track 10 interface FastEthernet0/1 line-protocol

!

interface FastEthernet0/0

ip address 172.29.160.1 255.255.255.0

glbp 10 ip 172.29.160.3

glbp 10 timers redirect 120 720

glbp 10 preempt delay minimum 30

glbp 10 weighting 100 lower 95 <========= Added

glbp 10 weighting track 10 decrement 10

!

Test-A#

Test-A#show track

Track 10

Interface FastEthernet0/1 line-protocol

Line protocol is Down (hw line state down)<==Change

24 changes, last change 00:02:14

Tracked by:

GLBP FastEthernet0/0 10

Test-A#

Test-A#show glbp

FastEthernet0/0 - Group 10

State is Active

5 state changes, last state change 07:17:50

Virtual IP address is 172.29.160.3

Hello time 3 sec, hold time 10 sec

Next hello sent in 1.288 secs

Redirect time 120 sec, forwarder time-out 720 sec

Preemption enabled, min delay 30 sec

Active is local

Standby is 172.29.160.2, priority 100 (expires in 9.024 sec)

Priority 100 (default)

Weighting 90, low (configured 100), thresholds: lower 95, upper 100 <============== Changed

Track object 10 state Down decrement 10

Load balancing: round-robin

Group members:

0015.f975.cdce (172.29.160.2)

0015.f975.f166 (172.29.160.1) local

There are 2 forwarders (0 active)

Forwarder 1

State is Listen

10 state changes, last state change 00:01:35

MAC address is 0007.b400.0a01 (default)

Owner ID is 0015.f975.f166

Redirection enabled

Preemption enabled, min delay 30 sec

Active is 172.29.160.2 (secondary), weighting 100 (expires in 7.584 sec)

Arp replies sent: 13

Forwarder 2

State is Listen

4 state changes, last state change 00:12:33

MAC address is 0007.b400.0a02 (learnt)

Owner ID is 0015.f975.cdce

Redirection enabled, 117.584 sec remaining (maximum 120 sec)

Time to live: 717.584 sec (maximum 720 sec)

Preemption enabled, min delay 30 sec

Active is 172.29.160.2 (primary), weighting 100 (expires in 7.584 sec)

Arp replies sent: 1

Test-A#

examples20001 · ‎12-08-2005

Hi All,

After doing some fine tunning, the change over between routers takes between 1sec to 8sec in different tests.

Below is the setup details.

Thank you very much.

http://www.cisco.com/warp/public/732/Tech/ipservices/docs/glbp.pdf

Test-A#

!

track 10 interface FastEthernet0/1 line-protocol

!

interface FastEthernet0/0

ip address 172.29.160.1 255.255.255.0

glbp 10 ip 172.29.160.3

glbp 10 timers redirect 120 720

glbp 10 preempt <============================changed

glbp 10 weighting 100 lower 95

glbp 10 weighting track 10 decrement 10

glbp 10 forwarder preempt delay minimum 0 <=========== Added

!

Test-A#

Test-A#show glbp

FastEthernet0/0 - Group 10

State is Active

5 state changes, last state change 1d01h

Virtual IP address is 172.29.160.3

Hello time 3 sec, hold time 10 sec

Next hello sent in 0.272 secs

Redirect time 120 sec, forwarder time-out 720 sec

Preemption enabled, min delay 0 sec <=======================changed

Active is local

Standby is 172.29.160.2, priority 100 (expires in 8.580 sec)

Priority 100 (default)

Weighting 100 (configured 100), thresholds: lower 95, upper 100

Track object 10 state Up decrement 10

Load balancing: round-robin

Group members:

0015.f975.cdce (172.29.160.2)

0015.f975.f166 (172.29.160.1) local

There are 2 forwarders (1 active)

Forwarder 1

State is Active

21 state changes, last state change 00:19:14

MAC address is 0007.b400.0a01 (default)

Owner ID is 0015.f975.f166

Redirection enabled

Preemption enabled, min delay 0 sec <====================changed

Active is local, weighting 100

Arp replies sent: 22

Forwarder 2

State is Listen

18 state changes, last state change 00:03:07

MAC address is 0007.b400.0a02 (learnt)

Owner ID is 0015.f975.cdce

Redirection enabled, 117.048 sec remaining (maximum 120 sec)

Time to live: 717.048 sec (maximum 720 sec)

Preemption enabled, min delay 0 sec <====================changed

Active is 172.29.160.2 (primary), weighting 100 (expires in 7.048 sec)

Arp replies sent: 11

Test-A#

Test-A#show glbp brief

Interface Grp Fwd Pri State Address Active router Standby route

Fa0/0 10 - 100 Active 172.29.160.3 local 172.29.160.2

Fa0/0 10 1 7 Active 0007.b400.0a01 local -

Fa0/0 10 2 7 Listen 0007.b400.0a02 172.29.160.2 -

Test-A#

Test-A#show track

Track 10

Interface FastEthernet0/1 line-protocol

Line protocol is Up

33 changes, last change 00:19:44

Tracked by:

GLBP FastEthernet0/0 10

Test-A#