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Cisco Bug: CSCur30305 - HMM should learn multiple IPV4/IPV6 address with same MAC

Last Modified

Jan 28, 2017

Products (1)

  • Cisco MDS 9000 NX-OS and SAN-OS Software

Known Affected Releases

6.0(2)N3(1) 7.0(2)NF(0.18)

Description (partial)

Symptom:
On leaf switches with Dynamic Fabric Automation enabled only 4 routes will be installed within the same VLAN with the same mac-address in a given vrf.

Although we have ARP entries for more than 4 IPs with same mac-address only 4 routes will be installed.

Example:
USDALDC-LFB3-B(config)# sh ip arp | in 0050.56b5.745d
10.218.44.5     00:12:46  0050.56b5.745d  Vlan644
10.218.44.6     00:12:41  0050.56b5.745d  Vlan644
10.218.44.7     00:10:22  0050.56b5.745d  Vlan644
10.218.44.8     00:09:50  0050.56b5.745d  Vlan644
10.218.44.9     00:16:18  0050.56b5.745d  Vlan644

USDALDC-LFB3-B(config)# show fabric forwarding internal mac-bd local-host-db 0050.56b5.745d 644

HMM MAC-BD DB information for VRF default
MAC Address     : 0050.56b5.745d
BD              : 644
Host Information for address family IPv4, refcount 4, Max Limit Log: True
    Host: 10.218.44.8/32
    mac: 0050.56b5.745d, svi: Vlan644, bd: 644, phy_intf: Ethernet151/1/10

    Host: 10.218.44.7/32
    mac: 0050.56b5.745d, svi: Vlan644, bd: 644, phy_intf: Ethernet151/1/10

    Host: 10.218.44.6/32
    mac: 0050.56b5.745d, svi: Vlan644, bd: 644, phy_intf: Ethernet151/1/10

    Host: 10.218.44.5/32
    mac: 0050.56b5.745d, svi: Vlan644, bd: 644, phy_intf: Ethernet151/1/10

Conditions:
Dynamic Fabric Automation should be implemented.
Same Mac-address should be mapped to more than 4 IPs in the same VLAN.
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