Hey guys,
I've been running into an issue and wondering if anyone else has experienced the same problem. I have an ASR 9006 running IOS XR 5.3.3 in my lab and I've created a test bridge domain. Within that bridge domain, under the access circuit, I've configured a mac limit of 50 with the 'no flood' action. When this limit is hit, mac address learning is disabled as expected, but the problem is that its never re-enabled. If i stop all traffic on that interface, the mac learning remains disabled indefinitely until I change the configuration to either remove mac limiting or change the action to none. I would like to think that at some point it it would back off and re-enable mac learning after seeing that the mac address count has dropped below the threshold. Any ideas?
RP/0/RSP0/CPU0:LAB-ASR9006-01#sho l2vpn bridge-domain bd-name 9 det
AC: GigabitEthernet0/2/0/9.300, state is up Type VLAN; Num Ranges: 1 VLAN ranges: [300, 300] MTU 8986; XC ID 0x208000c; interworking none MAC learning: disabled (MAC-limit action) Flooding: Broadcast & Multicast: enabled Unknown unicast: disabled (MAC-limit action) MAC aging time: 300 s, Type: inactivity MAC limit: 50, Action: limit, no-flood, Notification: syslog MAC limit reached: yes MAC port down flush: enabled MAC Secure: disabled, Logging: disabled Split Horizon Group: none Dynamic ARP Inspection: disabled, Logging: disabled IP Source Guard: disabled, Logging: disabled DHCPv4 snooping: disabled IGMP Snooping: enabled IGMP Snooping profile: none MLD Snooping profile: none Storm Control: bridge-domain policer Static MAC addresses: Statistics: packets: received 1437063 (multicast 189407949, broadcast 44127, unknown unicast 0, unicast 0), sent 18 bytes: received 301982330 (multicast 40280180924, broadcast 3293496, unknown unicast 0, unicast 0), sent 1008 MAC move: 0 Storm control drop counters: packets: broadcast 0, multicast 0, unknown unicast 0 bytes: broadcast 0, multicast 0, unknown unicast 0 Dynamic ARP inspection drop counters: packets: 0, bytes: 0 IP source guard drop counters: packets: 0, bytes: 0
RP/0/RSP0/CPU0:LAB-ASR9006-01#sho run l2vpn bridge group 9 Mon Feb 5 06:23:53.371 EST l2vpn bridge group 9 bridge-domain 9 mac aging time 300 ! withdraw state-down ! mtu 9000 interface GigabitEthernet0/2/0/9.300 mac limit maximum 50 action no-flood notification syslog ! ! ! vfi 9 vpn-id 9 autodiscovery bgp rd auto route-target 9:9 ! neighbor 192.168.2.100 pw-id 91 ! neighbor 192.168.2.200 pw-id 91 ! ! routed interface BVI9 ! ! !
RP/0/RSP0/CPU0:LAB-ASR9006-01#sho l2vpn forwarding bridge-domain 9:9 loc 0/2/CPU0 Mon Feb 5 06:29:21.345 EST Bridge MAC Bridge-Domain Name ID Ports addr Flooding Learning State -------------------------------- ------ ----- ------- -------- -------- --------- 9:9 0 4 0 Enabled Enabled UP
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