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Frequent Contributor I

GRE tunnel Issue

Hi Team,


We are having issue with gre tunnel the tunnel is not coming up.


Topology:

Two DMZ controllers

Multiple Local controllers.


Configuration is as below.


On MD:

*#show datapath session | include 10.112.60.248

10.112.60.248 10.226.100.92 47 0 0 0/0 0 0 0 local 6 0 0 F 11

10.226.100.92 10.112.60.248 47 0 0 1/0 0 0 0 local 6 1 64 FC 11
*#show running-config | begin "tunnel 702"

interface tunnel 702

description "Tunnel Description"

tunnel mode gre 27

tunnel source 10.226.100.92

tunnel destination 10.112.60.248

tunnel keepalive

trusted

no inter-tunnel-flooding

tunnel vlan 572-574

 

--------------------------------

 

On DMZ

 

 

#show datapath session | include 10.226.100.92

10.226.100.92 10.112.60.248 47 0 0 0/0 0 0 1 local 13 0 0 F 6

10.112.60.248 10.226.100.92 47 0 0 0/0 0 0 1 local 13 2 180 FC 6

#show running-config | begin "tunnel 702"

 

interface tunnel 702

description "Tunnel Description"

tunnel mode gre 27

tunnel source 10.112.60.248

tunnel destination 10.226.100.92

tunnel keepalive

trusted

no inter-tunnel-flooding

tunnel vlan 572-574

 

 

 

Regards,

Mallikarjun

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MVP Guru

Re: GRE tunnel Issue

Can you post the output of 'show interface tunnel [ID]' and is there a firewall between the two controllers with the required IP protocol open? 


ACMP, ACSA, ACDX #985
If my post addresses your query, give kudos:)
Highlighted
Frequent Contributor I

Re: GRE tunnel Issue

Hi Craige,

 

Thank you for the response.

 

Please find the details below.

 

#show interface tunnel 702

 

Tunnel 702 is up line protocol is down

Description: Tunnel Description

Source  10.226.100.92

Destination 10.112.60.248

Tunnel mtu is set to 1100

Tunnel is a Layer2 GRE TUNNEL

Tunnel is Trusted

Inter Tunnel Flooding is disabled

Tunnel keepalive is enabled

Keepalive type is Default

Tunnel keepalive interval is 10 seconds, retries 3

        Heartbeats sent 797, Heartbeats lost 796

        Tunnel is down 2 times

tunnel vlan 572-574

 

----------------------------

as per the customer the firewall is open for gre protocol

and also find the log below

#show datapath session | include 10.112.60.248

10.112.60.248   10.226.100.92   47   0     0      0/0     0    0   0   local       7    0          0          F               11

10.226.100.92   10.112.60.248   47   0     0      1/0     0    0   0   local       7    1          64         FC              11

 

 

Re

Highlighted
Frequent Contributor I

Re: GRE tunnel Issue

Hi Craig,

 

Find the datapath tunnel table logs from both controllers.

 

(HCAINNOI16F02DMZWLC02) #show datapath tunnel table | include 10.226.100.92

9 10.112.60.248 10.226.100.92 47 1b 1100 0 0 0 0 0 0 00:00:00:00:00:00 0 223949 0 TLEFPRf

 


(HTAINNOI21XXXWC01) *#show datapath tunnel table | include 10.112.60.248

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