I've been trying to get NLB running in my environment. My servers are running server 2008 in VMware. I have a pair of catalyst 3560X switches running HSRP and routing traffic.
I understand the problem with ARPs and mixing a unicast IP with a multicast mac. I've followed these instructions from teh cisco site:
http://www.cisco.com/en/US/products/hw/ ... 7203.shtml
After i did that stuff i was able to ping the cluster ip from a different subnet (couldn't before). Once I shut down one of the machines in the NLB cluster, I was no longer able to ping the cluster IP (both VMs in cluster were showing converged) from outside the subnet. I then tried pinging from the switches directly and found that I could my NLB cluster IP (10.1.0.60) from one switch (core2), but not from the other(core1), even when i source my ping from vlan 100 (the same the cluster is in).
I ran a debug packet and debug icmp and there is no output at all, which i find strange.
The two switches each have a connection to 2 ESXi hosts and the port #s are the same for both.
03bf.0a01.003c is the cluster MAC and 10.1.0.60 the cluster IP. The servers are in vlan 100.
Relevant config is below:
Switch 1 (not working)
arp 10.1.0.60 03bf.0a01.003c ARPA
mac address-table static 03bf.0a01.003c vlan 100 interface GigabitEthernet0/15 GigabitEthernet0/16
Switch 2 (working)
arp 10.1.0.60 03bf.0a01.003c ARPA
mac address-table static 03bf.0a01.003c vlan 100 interface GigabitEthernet0/15 GigabitEthernet0/16
Show command output
The show ip arp and show mac address-table output are the same on each switch:
core2#show ip arp 10.1.0.60
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.1.0.60 - 03bf.0a01.003c ARPA
core2#show mac address-table address 03bf.0a01.003c
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
100 03bf.0a01.003c STATIC Gi0/15 Gi0/16
Total Mac Addresses for this criterion: 1
debug output when I ping cluster ip 10.1.0.60
On Switch 1 (no output):
core1#debug ip packet 95
core1#debug ip icmp
core1#ping 10.1.0.60
pak 44FE900 consumed in input feature , packet consumed, MCI Check(63), rtype 0, forus FALSE, sendself FALSE, mtu 0
pak 44F8054 consumed in input feature , packet consumed, MCI Check(63), rtype 0, forus FALSE, sendself FALSE, mtu 0
On switch2 (works):
core2#ping 10.1.0.60
Jul 19 09:38:34.702 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, input feature, MCI Check(63), rtype 0, forus FALSE, sendself FALSE, mtu 0
Jul 19 09:38:34.702 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, rcvd 2
Jul 19 09:38:34.710 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, stop process pak for forus packet
Jul 19 09:38:34.710 EDT: ICMP: echo reply rcvd, src 10.1.0.60, dst 10.1.0.3
Jul 19 09:38:34.710 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, input feature, MCI Check(63), rtype 0, forus FALSE, sendself FALSE, mtu 0
Jul 19 09:38:34.710 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, rcvd 2
Jul 19 09:38:34.710 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, stop process pak for forus packet
Jul 19 09:38:34.710 EDT: ICMP: echo reply rcvd, src 10.1.0.60, dst 10.1.0.3
Jul 19 09:38:34.710 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, input feature, MCI Check(63), rtype 0, forus FALSE, sendself FALSE, mtu 0
Jul 19 09:38:34.710 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, rcvd 2
Jul 19 09:38:34.710 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, stop process pak for forus packet
Jul 19 09:38:34.710 EDT: ICMP: echo reply rcvd, src 10.1.0.60, dst 10.1.0.3
Jul 19 09:38:34.710 EDT: IP: s=10.1.0.60 (Vlan100), d=10.1.0.3, len 100, input feature, MCI Check(63), rtype 0, forus FALSE, sendself FALSE, mtu 0!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/4/9 ms
pak 3EAD104 consumed in input feature , packet consumed, MCI Check(63), rtype 0, forus FALSE, sendself FALSE, mtu 0
pak 44F3BC0 consumed in input feature , packet consumed, MCI Check(63), rtype 0, forus FALSE, sendself FALSE, mtu 0
Does anyone have any idea of what i'm missing here? Hardware is identical. IOS is the same. Configs are the same. I'm not sure what else to look at...
Thx
