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OTV Tunnel CSR1000V - packet loss

aocana73961
Level 1
Level 1

‎11-02-2022 08:02 AM

Hi Dears, I have a problem with the OTV tunnel site to site, for some reason I have packet loss from time to time, I don't see any errors or drops on the interfaces.

SW-SITE1#ping 10.24.1.101 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 10.24.1.101, timeout is 2 seconds:
.....!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 95 percent (95/100), round-trip min/avg/max = 1/2/16 ms
SW-SITE1#ping 10.24.1.101 repeat 100
Type escape sequence to abort.
Sending 100, 100-byte ICMP Echos to 10.24.1.101, timeout is 2 seconds:
........................................................!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Success rate is 44 percent (44/100), round-trip min/avg/max = 1/2/4 ms
SW-SITE1#ping 10.24.1.101 repeat 1000
Type escape sequence to abort.
Sending 1000, 100-byte ICMP Echos to 10.24.1.101, timeout is 2 seconds:
................................................!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!..................!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
GigabitEthernet2 is up, line protocol is up
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
30 second input rate 603389000 bits/sec, 69142 packets/sec
30 second output rate 5000 bits/sec, 4 packets/sec
29305423257 packets input, 39433559808642 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
1425270 packets output, 226013657 bytes, 0 underruns
Output 0 broadcasts (0 IP multicasts)
0 output errors, 0 collisions, 0 interface resets
57548 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
GigabitEthernet1 is up, line protocol is up
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 3000 bits/sec, 3 packets/sec
5 minute output rate 6000 bits/sec, 1 packets/sec
2310 packets input, 340213 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 0 multicast, 0 pause input
1761 packets output, 380989 bytes, 0 underruns
Output 0 broadcasts (0 IP multicasts)
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out

some information about the OTV tunnel

CSR-OTV1#show otv
Overlay Interface Overlay1
VPN name : OTV-1
VPN ID : 1
State : UP
Fwd-capable : Yes
Fwd-ready : Yes
AED-Server : Yes
Backup AED-Server : No
AED Capable : Yes
Join interface(s) : GigabitEthernet1
Join IPv4 address : 10.24.20.2
Tunnel interface(s) : Tunnel0
Encapsulation format : GRE/IPv4
Site Bridge-Domain : 11
Capability : Unicast-only
Is Adjacency Server : Yes
Adj Server Configured : Yes
Prim/Sec Adj Svr(s) : 10.24.20.2
CSR-OTV-2#show otv
Overlay Interface Overlay1
VPN name : OTV-2
VPN ID : 1
State : UP
Fwd-capable : Yes
Fwd-ready : Yes
AED-Server : Yes
Backup AED-Server : No
AED Capable : Yes
Join interface(s) : GigabitEthernet1
Join IPv4 address : 10.24.40.2
Tunnel interface(s) : Tunnel0
Encapsulation format : GRE/IPv4
Site Bridge-Domain : 12
Capability : Unicast-only
Is Adjacency Server : No
Adj Server Configured : Yes
Prim/Sec Adj Svr(s) : 10.24.20.2
CSR-OTV-1#show otv route
Codes: BD - Bridge-Domain, AD - Admin-Distance,
SI - Service Instance, * - Backup Route
OTV Unicast MAC Routing Table for Overlay1
Inst VLAN BD MAC Address AD Owner Next Hops(s)
----------------------------------------------------------
0 1752 101 0000.0c07.acf0 40 BD Eng Gi2:SI101
0 1752 101 0008.e3ff.fc04 40 BD Eng Gi2:SI101
0 1752 101 001e.bd11.f2bc 50 ISIS CSR-OTV-2
0 1752 101 002a.6a08.863c 40 BD Eng Gi2:SI101
*0 1752 101 002a.6a08.863c 50 ISIS CSR-OTV-2
0 1752 101 002a.6a62.debc 40 BD Eng Gi2:SI101
0 1752 101 0050.5698.0333 40 BD Eng Gi2:SI101
*0 1752 101 0050.5698.0333 50 ISIS CSR-OTV-2
0 1752 101 0050.56a3.7356 50 ISIS CSR-OTV-2
0 1752 101 0050.56a8.4bbe 40 BD Eng Gi2:SI101
*0 1752 101 0050.56a8.4bbe 50 ISIS CSR-OTV-2
0 1752 101 0050.56a8.60b6 40 BD Eng Gi2:SI101
*0 1752 101 0050.56a8.60b6 50 ISIS CSR-OTV-2
0 1752 101 00e0.ec2f.8545 40 BD Eng Gi2:SI101
*0 1752 101 00e0.ec2f.8545 50 ISIS CSR-OTV-2
0 1752 101 00e0.ec2f.8b91 40 BD Eng Gi2:SI101
*0 1752 101 00e0.ec2f.8b91 50 ISIS CSR-OTV-2
0 1752 101 00e0.ec2f.8c0d 30 ISIS CSR-OTV-2
CSR-OTV-2#show otv route
Codes: BD - Bridge-Domain, AD - Admin-Distance,
SI - Service Instance, * - Backup Route
OTV Unicast MAC Routing Table for Overlay1
Inst VLAN BD MAC Address AD Owner Next Hops(s)
----------------------------------------------------------
0 1752 101 0000.0c07.acf0 50 ISIS CSR-OTV-1
0 1752 101 0008.e3ff.fc04 40 BD Eng Gi2:SI101
0 1752 101 001e.bd11.f2bc 40 BD Eng Gi2:SI101
0 1752 101 002a.6a08.863c 40 BD Eng Gi2:SI101
*0 1752 101 002a.6a08.863c 50 ISIS CSR-OTV-1
0 1752 101 002a.6a62.debc 50 ISIS CSR-OTV-1
0 1752 101 0050.5698.0333 40 BD Eng Gi2:SI101
*0 1752 101 0050.5698.0333 50 ISIS CSR-OTV-1
0 1752 101 0050.56a3.7356 40 BD Eng Gi2:SI101
0 1752 101 0050.56a8.4bbe 40 BD Eng Gi2:SI101
*0 1752 101 0050.56a8.4bbe 50 ISIS CSR-OTV-1
0 1752 101 0050.56a8.60b6 40 BD Eng Gi2:SI101
*0 1752 101 0050.56a8.60b6 50 ISIS CSR-OTV-1
0 1752 101 00e0.ec2f.8545 40 BD Eng Gi2:SI101
*0 1752 101 00e0.ec2f.8545 50 ISIS CSR-OTV-1
0 1752 101 00e0.ec2f.8b91 40 BD Eng Gi2:SI101
*0 1752 101 00e0.ec2f.8b91 50 ISIS CSR-OTV-1
0 1752 101 00e0.ec2f.8c0d 40 BD Eng Gi2:SI101
0 1752 101 00e0.ec2f.b63d 40 BD Eng Gi2:SI101
*0 1752 101 00e0.ec2f.b63d 50 ISIS CSR-OTV-1
0 1752 101 00e0.ec30.2295 40 BD Eng Gi2:SI101
*0 1752 101 00e0.ec30.2295 50 ISIS CSR-OTV-1
CSR-OTV-1#show otv adjacency
Overlay Adjacency Database for overlay 1
Hostname       System-ID             Dest  Addr       Site-ID                     Up Time   State
CSR-OTV-2   001e.bd11.f200   10.24.40.2         0002.0002.0002       4d22h    UP
CSR-OTV-2#show otv adjacency
Overlay Adjacency Database for overlay 1
Hostname             System-ID           Dest Addr         Site-ID                    Up Time   State
CSR-OTV-1    001e.e584.c700     10.24.20.2        0001.0001.0001     4d22h         UP

If anyone has any information or advice it would be appreciated.

Regards,

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1 Reply 1

marce1000
VIP
VIP

‎11-02-2022 10:46 AM

 

 - You may need to tweak tunnel MTU settings  on the OTV tunnel (lowering) ; ref - https://community.cisco.com/t5/routing/otv-tunnel-csr1000v-packet-loss/m-p/4714914

 >...Configure the join interface and all Layer 3 interfaces that face the IP core between the OTV edge devices with the highest maximum transmission unit (MTU) size supported by the IP core. OTV sets the Don't Fragment (DF) bit in the IP header for all OTV control and data packets so the core cannot fragment these packets.

 M.



-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
    When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '
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