Trying to retrieve SNMP IpAddrTable (OID =1.3.6.1.2.1.4.20) regardless of VRF configuration. MIBWALK gives all the unique VRF specific (+ default) IP addresses,however fails to identify overlapping IPs.
See output below.
===========================================================================
Cisco 3725/ IOS No-Overlapping IPs (all unique IPs are displayed)
===========================================================================
Router#show ip vrf interfaces
Interface IP-Address VRF Protocol
Vl1000 10.10.10.1 vpn1 up
Vl1001 10.10.10.2 vpn2 up
Router#
{VRF config}
interface Vlan1000
ip vrf forwarding vpn1
ip address 10.10.10.1 255.255.255.0
!
interface Vlan1001
ip vrf forwarding vpn2
ip address 10.10.10.2 255.255.255.0
>snmpwalk.exe -v 2c -c public 172.26.60.187 1.3.6.1.2.1.4.20
iso.3.6.1.2.1.4.20.1.1.10.10.10.1 = IpAddress: 10.10.10.1 ====> VRF IP1
iso.3.6.1.2.1.4.20.1.1.10.10.10.2 = IpAddress: 10.10.10.2 ====> VRF IP2
iso.3.6.1.2.1.4.20.1.1.172.26.60.187 = IpAddress: 172.26.60.187====> DEFAULT
iso.3.6.1.2.1.4.20.1.2.10.10.10.1 = INTEGER: 48
iso.3.6.1.2.1.4.20.1.2.10.10.10.2 = INTEGER: 49
iso.3.6.1.2.1.4.20.1.2.172.26.60.187 = INTEGER: 5
iso.3.6.1.2.1.4.20.1.3.10.10.10.1 = IpAddress: 255.255.255.0
iso.3.6.1.2.1.4.20.1.3.10.10.10.2 = IpAddress: 255.255.255.0
iso.3.6.1.2.1.4.20.1.3.172.26.60.187 = IpAddress: 255.255.255.0
iso.3.6.1.2.1.4.20.1.4.10.10.10.1 = INTEGER: 1
iso.3.6.1.2.1.4.20.1.4.10.10.10.2 = INTEGER: 1
iso.3.6.1.2.1.4.20.1.4.172.26.60.187 = INTEGER: 1
iso.3.6.1.2.1.4.20.1.5.10.10.10.1 = INTEGER: 18024
iso.3.6.1.2.1.4.20.1.5.10.10.10.2 = INTEGER: 18024
iso.3.6.1.2.1.4.20.1.5.172.26.60.187 = INTEGER: 18024
-----------------------------------------------
VRF IPs: 10.10.10.1, 10.10.10.2
Default : 172.26.60.187
-----------------------------------------------
=============================================================================
Cisco 3725/ IOS Overlapping IPs (Only one instance is seen (one is enough ?!))
=============================================================================
Router#show ip vrf
Name Default RD Interfaces
vpn1 1:1000 Vl1000
vpn2 1:1001 Vl1001
Router#
Router#show ip vrf in
Router#show ip vrf interfaces
Interface IP-Address VRF Protocol
Vl1000 10.10.10.1 vpn1 up
Vl1001 10.10.10.1 vpn2 up
Router#
Router#
Router#
Router#ping vrf vpn1 10.10.10.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
Router#ping vrf vpn2 10.10.10.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds:
!!!!!
{VRF config}
interface Vlan1000
ip vrf forwarding vpn1
ip address 10.10.10.1 255.255.255.0
!
interface Vlan1001
ip vrf forwarding vpn2
ip address 10.10.10.1 255.255.255.0
->snmpwalk.exe -v 2c -c public 172.26.60.187 1.3.6.1.2.1.4.20
iso.3.6.1.2.1.4.20.1.1.10.10.10.1 = IpAddress: 10.10.10.1 =================> VRF-IP (Only one instance is seen ?)
iso.3.6.1.2.1.4.20.1.1.172.26.60.187 = IpAddress: 172.26.60.187 ============> Default-VRF
iso.3.6.1.2.1.4.20.1.2.10.10.10.1 = INTEGER: 49
iso.3.6.1.2.1.4.20.1.2.172.26.60.187 = INTEGER: 5
iso.3.6.1.2.1.4.20.1.3.10.10.10.1 = IpAddress: 255.255.255.0
iso.3.6.1.2.1.4.20.1.3.172.26.60.187 = IpAddress: 255.255.255.0
iso.3.6.1.2.1.4.20.1.4.10.10.10.1 = INTEGER: 1
iso.3.6.1.2.1.4.20.1.4.172.26.60.187 = INTEGER: 1
iso.3.6.1.2.1.4.20.1.5.10.10.10.1 = INTEGER: 18024
iso.3.6.1.2.1.4.20.1.5.172.26.60.187 = INTEGER: 18024
---------------------------------
VRF IP: 10.10.10.1 (Only one specific instance is given. Why ?)
Default : 172.26.60.187
----------------------------------
Could you explain this behavior?
Thanks,
Ranil.
