Troubleshooting guide

Release Notes for Cisco ONS 15454 Release 7.0.2

OL-11368-01

Caveats

http://www-tac.cisco.com/Support_Library/field_alerts/fn13171.html

This issue can last for a few seconds (typically less). The workaround is to avoid issuing any operation

(such as the “Clear all MAC” command) that clears the complete MAC table under heavy traffic loads.

To recover from this issue, wait for a few seconds to let the invalid addresses age out, and to allow the

software to restore the well-known/static MAC addresses.

CSCdy37198

On Cisco ONS 15454s equipped with XCVT cross-connect cards, neither the E100T-12 nor the E1000-2

cards raise an alarm or condition in CTC when Ethernet traffic is predictably lost due to the following

circumstances:

Circuits exist between Ethernet cards (E100T-12 and/or E1000-2) built over Protection Channel Access

(PCA) bandwidth on BLSR spans. When BLSR issues a switch, the PCA bandwidth is preempted. Since

there is no longer a connection between the ends of the Ethernet circuit, traffic is lost.

Note In nodes equipped with XC10G, these Ethernet cards will raise an AIS-P condition.

This issue will not be resolved.

CSCdr94172

Multicast traffic can cause minimal packet loss on the E1000-2, E100-12, and E100-4 cards. Packet loss

due to normal multicast control traffic should be less than 1%. This issue was resolved in Release 2.2.1

for broadcast, and in Release 2.2.2 for OSPF, and some multicast frames. As of Release 3.0.3, the ONS

15454 supports HSRP, CDP, IGMP, PVST, and EIGRP, along with the previously supported broadcast

and OSPF.

Note If multicast is used for such applications as video distribution, significant loss of unicast

and multicast traffic will result. These cards were not designed for, and therefore should

not be used for, such applications.

Note If the multicast and flood traffic is very rare and low-rate, as occurs in most networks due

to certain control protocols and occasional learning of new MAC addresses, the loss of

unicast frames will be rare and likely unnoticeable.

Note A workaround for this issue is to use the port-mapped mode of the E-series cards.

Multicast MAC addresses used by the control protocols in Table 4 have been added to the static MAC

address table to guarantee no loss of unicast traffic during normal usage of these MAC addresses.