Troubleshooting ERSPAN reachability errors
Follow these examples to troubleshoot and
resolve ERSPAN destination not reachable errors.
device# show erspan profile 1 Profile 1 Type ERSPAN Mirror destination Not reachable. Reason: *********** Destination IP 10.1.1.100 Destination MAC 0000.0000.0000 Source IP 10.1.1.1 Source MAC cc4e.0000.0000 Ports monitored: Input monitoring : (U1/M1) 1 Output monitoring : (U1/M1) 1 HW destination id for each device: stack_id/device:dest_id
Mirror destination Not reachable error occurs.
| Case | Reason |
|---|---|
| 1 | ARP is not resolved. |
| 2 | Route does not exist. |
| 3 | Outgoing port is a management port. |
| 4 | Outgoing port is a loopback port. |
| 5 | Outgoing port is a GRE IP tunnel port. |
| 6 | Outgoing port is not known. |
| 7 | Outgoing port is a sink port. |
Follow these examples to resolve the errors.
Case 1: Problem: ARP not resolved
device(config-vif-66)# show erspan profile 1 Profile 1 Mirror destination Not reachable. Reason: ARP not resolved Destination IP 10.10.10.4 Destination MAC 0000.0000.0000 Source IP 10.10.10.1 Source MAC 0000.0000.0000 Ports monitored: HW destination id for each device: stack_id/device:dest_id
device(config-vif-66)# show arp Total number of ARP entries: 1 Entries in default routing instance: No. IP Address MAC Address Type Age Port Status 1 10.10.10.4 None Dynamic 1 v66 Pend device(config-vif-66)# arp 10.10.10.4 aa.bb.cc ethernet 1/1/5 ADD static arp 10.10.10.4 -> 00aa.00bb.00cc -> 1/1/5 (VRF: 0) device(config-vif-66)# show erspan profile all Profile 1 Type ERSPAN Mirror destination Reachable. Destination IP 10.10.10.4 Destination MAC 00aa.00bb.00cc Source IP 10.10.10.1 Source MAC 748e.f8f9.6d80 Outgoing port 1/1/5 Outgoing VLAN 66 Outgoing VE 66 Ports monitored: HW destination id for each device: stack_id/device:dest_id
Case 2: Problem: Route not exist
device(config-vif-66)# show ip route
Total number of IP routes: 1
Type Codes - B:BGP D:Connected O:OSPF R:RIP S:Static; Cost - Dist/Metric
BGP Codes - i:iBGP e:eBGP
OSPF Codes - i:Inter Area 1:External Type 1 2:External Type 2
Destination Gateway Port Cost Type Uptime
1 10.10.10.0/24 DIRECT ve 66 0/0 D 0m48s
device(config-vif-66)# disable
SYSLOG: <14> Jan 1 00:02:40 SWDR_8 System: Interface ve 66, state down
device(config-vif-66)# show erspan profile all
Profile 1
Type ERSPAN
Mirror destination Not reachable.
Reason: Route not exist
Destination IP 10.10.10.4
Destination MAC 0000.0000.0000
Source IP 10.10.10.1
Source MAC 748e.f8f9.6d80
Ports monitored:
HW destination id for each device:
stack_id/device:dest_id
Solution - Enable the interface (VIF)
device(config-vif-66)# enable SYSLOG: <14> Jan 1 00:03:07 SWDR_8 System: Interface ve 66, state up device(config-vif-66)# show erspan profile all Profile 1 Type ERSPAN Mirror destination Reachable. Destination IP 10.10.10.4 Destination MAC 00aa.00bb.00cc Source IP 10.10.10.1 Source MAC 748e.f8f9.6d80 Outgoing port 1/1/5 Outgoing VLAN 66 Outgoing VE 66 Ports monitored: HW destination id for each device: stack_id/device:dest_id
Case 3: Problem: Outgoing port is management
port
device(config-vif-66)# show erspan profile 1 Profile 1 Type ERSPAN Mirror destination Not reachable. Reason: Outgoing port is management port Destination IP 10.10.10.4 Destination MAC 0000.0000.0000 Source IP 10.10.10.1 Source MAC 748e.f8f9.6d80 Ports monitored: HW destination id for each device: stack_id/device:dest_id device(config-vif-66)# show ip route Total number of IP routes: 2 Type Codes - B:BGP D:Connected O:OSPF R:RIP S:Static; Cost - Dist/Metric BGP Codes - i:iBGP e:eBGP OSPF Codes - i:Inter Area 1:External Type 1 2:External Type 2 Destination Gateway Port Cost Type Uptime 1 10.10.10.0/24 DIRECT e mgmt1 0/0 D 0m2s 2 40.40.40.0/24 DIRECT e mgmt1 0/0 D 0m2s
The router for an ERSPAN destination IP can be
learned by routing protocols (RIP, OSPF, etc.) or you can configure it statically
using the ip route
command. The commands disable or enable, when run on the
port, remove or add routes, respectively.
There is no solution to this problem if you continue to use a management port as the outgoing port. You cannot use an IP address reachable through a management port as an ERSPAN destination.
Case 4: Problem: Outgoing port is loopback
port
device# show erspan profile 1 Profile 1 Type ERSPAN Mirror destination Not reachable. Reason: Outgoing port is loopback port Destination IP 10.10.10.4 Destination MAC 0000.0000.0000 Source IP 10.10.10.1 Source MAC 0000.0000.0000 Ports monitored: HW destination id for each device: stack_id/device:dest_id device# show ip route Total number of IP routes: 1 Type Codes - B:BGP D:Connected O:OSPF R:RIP S:Static; Cost - Dist/Metric BGP Codes - i:iBGP e:eBGP OSPF Codes - i:Inter Area 1:External Type 1 2:External Type 2 Destination Gateway Port Cost Type Uptime 1 10.10.10.0/24 DIRECT loopback 1 0/0 D 0m39s
There is no solution to this problem if you continue to use an IP address reachable through a loopback interface. You cannot use an IP address reachable through a loopback interface as an ERSPAN destination.
Case 5: Problem: Outgoing port is GRE IP tunnel
port
device# show erspan profile 1 Profile 1 Type ERSPAN Mirror destination Not reachable. Reason: Outgoing port is GRE IP tunnel port Destination IP 11.1.1.2 Destination MAC 0000.0000.0000 Source IP 33.33.33.2 Source MAC 0000.0000.0000 Ports monitored: HW destination id for each device: stack_id/device:dest_id device(config)# show running-config | begin erspan monitor-profile 1 type erspan destination-ip 11.1.1.2 source-ip 33.33.33.2 device# show ip interface Interface IP-Address OK? Method Status Protocol VRF Eth mgmt1 10.37.78.91 YES NVRAM up up default-vrf Ve 33 33.33.33.2 YES NVRAM down down default-vrf Ve 44 10.10.10.1 YES manual up up default-vrf Tunnel 1 11.1.1.1 YES manual up up default-vrf
There is no solution to this problem if you continue to use an IP address reachable through a tunnel interface. You cannot use an IP address reachable through a tunnel interface as an ERSPAN destination.
Case 6: Problem: Outgoing port is not
known
device# show erspan profile 1 Profile 1 Type ERSPAN Mirror destination Not reachable. Reason: Outgoing port is not known Destination IP 11.1.1.2 Destination MAC 0000.0000.0000 Source IP 33.33.33.2 Source MAC 0000.0000.0000 Ports monitored: HW destination id for each device: stack_id/device:dest_id
Solution - The same as with Case 2 Problem: Route not exist.
Case 7: Problem: Outgoing port is a sink
port
device# show erspan profile 1 Profile 1 Type ERSPAN Mirror destination Not reachable. Reason: Outgoing port is a sink port Destination IP 11.1.1.2 Destination MAC 0000.0000.0000 Source IP 33.33.33.2 Source MAC 0000.0000.0000 Ports monitored: HW destination id for each device: stack_id/device:dest_id
Solution - The same as with Case 2 Problem: Route not exist..