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Problem ip SLA not update Gateway of last resort

admintitrsb
Level 1
Level 1

‎04-02-2018 01:13 PM - edited ‎03-08-2019 02:29 PM

Hello,

 

In 3750 Switch i have IP SLA configuation

ip local policy route-map ICMP_SLA
ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 10
ip route 0.0.0.0 0.0.0.0 192.168.0.250 200

But my Gateway of last resort is not updated by IP SLA and the default route stay to the secondary link

Pirmary GTW : 192.168.1.1

Secondary GTW : 192.168.0.250

#sh ip route track-table
 ip route 0.0.0.0 0.0.0.0 192.168.1.1 track 10 state is [up]

#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is 192.168.0.250 to network 0.0.0.0

S*    0.0.0.0/0 [200/0] via 192.168.0.250
      10.0.0.0/8 is variably subnetted, 17 subnets, 3 masks

If i disconect my interface to secondary GTW all internet is Down.

have you ever seen this problem ?

Thanks

Labels:
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10 Replies 10

Reza Sharifi
Hall of Fame
Hall of Fame

‎04-02-2018 01:25 PM

Hi,

192.168.1.1 is not in your routing table. Are you sure it is alive?

Can you ping it?

Can you trace route to an Internet destination sourcing it from 192.168.1.x?

Are both GTWs in the same subnet?

HTH

0 Helpful

admintitrsb
Level 1
Level 1
In response to Reza Sharifi

‎04-02-2018 01:37 PM

Hi

yes the GTW are in the same subnet (192.168.0.0/22) and i can ping it 

 

#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/9 ms

See routing Table :

 

 

#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is 192.168.0.250 to network 0.0.0.0

S*    0.0.0.0/0 [200/0] via 192.168.0.250
      10.0.0.0/8 is variably subnetted, 17 subnets, 3 masks
C        10.1.0.0/24 is directly connected, Vlan100
L        10.1.0.2/32 is directly connected, Vlan100
**********Other Routes in 10.0.0.0 subnets************
L        10.47.85.128/32 is directly connected, Virtual3
C     192.168.0.0/22 is directly connected, Vlan1
      192.168.1.0/32 is subnetted, 1 subnets
L        192.168.1.7 is directly connected, Vlan1

For Traceroute:

 

 

#traceroute 8.8.8.8
Type escape sequence to abort.
Tracing the route to 8.8.8.8
VRF info: (vrf in name/id, vrf out name/id)
  1 72.142.127.41 9 msec 33 msec 8 msec --> is My Wan GTW on my secondary internet link
  2 209.148.252.106 8 msec 8 msec 8 msec
  3 209.148.249.214 25 msec 17 msec 0 msec
  4 209.148.229.225 17 msec 25 msec 8 msec
  5 209.148.235.137 17 msec
    209.148.230.14 25 msec 17 msec
  6 72.14.222.87 16 msec 33 msec 16 msec
  7 108.170.250.225 9 msec 8 msec 34 msec
  8 108.170.227.43 16 msec
    108.170.227.171 8 msec
    108.170.236.11 34 msec
  9 google-public-dns-a.google.com (8.8.8.8) 16 msec 42 msec 16 msec

 

0 Helpful

Reza Sharifi
Hall of Fame
Hall of Fame
In response to admintitrsb

‎04-02-2018 02:03 PM

Can you clarify?

You have an SVI for vlan 1 on the 3750 with IP address of 192.168.1.7?

The peer IPs are 192.168.1.1 and 192.168.0.250

They are all in a /22 subnet?

 

HTH

 

0 Helpful

admintitrsb
Level 1
Level 1
In response to Reza Sharifi

‎04-02-2018 02:22 PM

Yes all ip are in VLAN1

192.168.0.0/22

129.168.1.7 : Is my Core Switch 3750

192.168.1.1 is my FireWall-1 (Primary internet link)

192.168.0.250 is My FireWall-2 (Secondary internet link)

0 Helpful

Reza Sharifi
Hall of Fame
Hall of Fame
In response to admintitrsb

‎04-02-2018 04:20 PM

Can you try the same default routes without the tracking configuration and see if the primary shows up in the routing table?

Also, what is the output of "sh ver" from the 3750?

HTH

0 Helpful

admintitrsb
Level 1
Level 1
In response to Reza Sharifi

‎04-03-2018 02:42 PM

Hi

 

Can you explain me what you are saying by : "without the tracking configuration" 

There is the show version :

#sh vers
Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 15.2(4)E5, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2017 by Cisco Systems, Inc.
Compiled Mon 18-Sep-17 06:58 by prod_rel_team

ROM: Bootstrap program is C3750E boot loader
BOOTLDR: C3750E Boot Loader (C3750X-HBOOT-M) Version 12.2(53r)SE2, RELEASE SOFTWARE (fc1)

**SWITCHNAME** uptime is 16 weeks, 4 days, 14 hours, 11 minutes
System returned to ROM by power-on
System restarted at 06:35:53 UTC Fri Dec 8 2017
System image file is "flash:/c3750e-universalk9-mz.152-4.E5/c3750e-universalk9-mz.152-4.E5.bin"
Last reload reason: power-on

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

License Level: ipbase
License Type: Permanent
Next reload license Level: ipbase

cisco WS-C3750X-24 (PowerPC405) processor (revision A0) with 262144K bytes of memory.
Processor board ID FDO152*****
Last reset from power-on
22 Virtual Ethernet interfaces
1 FastEthernet interface
56 Gigabit Ethernet interfaces
4 Ten Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 44:D3:CA:**:**:**
Motherboard assembly number     : 73-12530-05
Motherboard serial number       : FDO152*****
Model revision number           : A0
Motherboard revision number     : B0
Model number                    : WS-C3750X-24T-S
Daughterboard assembly number   : 800-32727-01
Daughterboard serial number     : FDO152*****
System serial number            : FDO152*****
Top Assembly Part Number        : 800-31327-02
Top Assembly Revision Number    : C0
Version ID                      : V02
CLEI Code Number                : COMJV*****
Hardware Board Revision Number  : 0x03

Switch Ports Model                     SW Version            SW Image
------ ----- -----                     ----------            ----------
     1 30    WS-C3750X-24              15.2(4)E5             C3750E-UNIVERSALK9-M
*    2 30    WS-C3750X-24              15.2(4)E5             C3750E-UNIVERSALK9-M

Switch 01
---------
Switch Uptime                   : 16 weeks, 4 days, 12 hours, 42 minutes
Base ethernet MAC Address       : 44:D3:CA:**:**:**
Motherboard assembly number     : 73-12530-05
Motherboard serial number       : FDO152*****
Model revision number           : A0
Motherboard revision number     : B0
Model number                    : WS-C3750X-24T-S
Daughterboard assembly number   : 800-32727-01
Daughterboard serial number     : FDO152*****
System serial number            : FDO152*****
Top assembly part number        : 800-31327-02
Top assembly revision number    : C0
Version ID                      : V02
CLEI Code Number                : COMJV*****
License Level                   : ipbase
License Type                    : Permanent
Next reboot licensing Level     : ipbase

Configuration register is 0xF
0 Helpful

Meheretab Mengistu
Level 7
Level 7
In response to admintitrsb

‎04-03-2018 03:42 PM

Hi,

 

Please share your configuration so that we could see where the static route is blocked. There could be a policy or an access-list blocking the traffic. Also, share us the output of "sh ip sla statistics".

 

 

HTH,
Meheretab
0 Helpful

admintitrsb
Level 1
Level 1
In response to Meheretab Mengistu

‎04-05-2018 11:24 AM

Hi

 

Here is the informations :

#sh ip sla statistics
IPSLAs Latest Operation Statistics

IPSLA operation id: 1
        Latest RTT: 23 milliseconds
Latest operation start time: 18:09:26 UTC Thu Apr 5 2018
Latest operation return code: OK
Number of successes: 525
Number of failures: 0
Operation time to live: Forever

IPSLA operation id: 2
        Latest RTT: 9 milliseconds
Latest operation start time: 18:09:26 UTC Thu Apr 5 2018
Latest operation return code: OK
Number of successes: 523
Number of failures: 1
Operation time to live: Forever
Preview file
19 KB
0 Helpful

Reza Sharifi
Hall of Fame
Hall of Fame
In response to admintitrsb

‎04-03-2018 04:38 PM

What I mean is this

ip route 0.0.0.0 0.0.0.0 192.168.1.1 
ip route 0.0.0.0 0.0.0.0 192.168.0.250 200

no ip local policy route-map ICMP_SLA

So, no sla policy and no track at the end of the first default route.

Also, looking at your switch, you have IP Base license. In order to run SLA, IP Services license needed but let's try above and see if the first default route shows up in the routing table.

HTH

0 Helpful

admintitrsb
Level 1
Level 1
In response to Reza Sharifi

‎04-05-2018 11:07 AM

Hi

just to make sure there is a risk of losing the connection with the switch by disabling IP SLA?
My Switch is remote (several hundred kilometers)

Thanks

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