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New Member

GLBP.

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.

2 REPLIES
New Member

Re: GLBP.

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#

New Member

Re: GLBP.

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#

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