Avaya BayRS Version 15.4.2.0 Notice download pdf (Page 52)

Release Notes for BayRS Version 15.4.2.0

40 308663-15.4.2.0 Rev 00

ARN 10MB Ethernet Base Module – MTU for 802.1Q Tagging

When you configure VLAN tagging on the ARN 10MB Ethernet Base Module,

the MTU for the interface is set to 1518 bytes for packets on this line. Although

the Ethernet Base Module supports tagged packets, it does not support 802.1Q

tagged frames of greater than 1518 bytes (1514 plus 4-byte tag). However, there

are other Ethernet interfaces (for example, Ethernet and Tri-Serial Expansion

Module or the 10/100-TX UTP Base Module) with an MTU of 1522 which

support the maximum size tagged packet (1518 plus 4-byte tag).

You may have

to correct for this by reducing the MTU set for the other tagged hosts on the

LAN attached to the 10BT motherboard Ethernet port to 1518 bytes.

ATM

The following limitations exist for ATM services in BayRS:

• Failover and load balancing for ATM VCs is not supported. You can configure

multiple ATM virtual circuits (VCs) to the same destination address.

However, this kind of configuration does not provide load balancing or

failover support.

• The ATM traffic parameter maximum burst size (MBS) is not supported.

• Differentiated Services Queue Management and Scheduling (DSQMS) is not

supported in ATM.

• Using the BCC to delete an ATM interface or a service record with more than

570 PVCs can cause a watchdog timeout on the router. To prevent this from

occurring on configurations with more than 570 PVCs, use Site Manager to

delete the interface, or use the BCC to delete the PVCs before you delete the

ATM interface.

• If there is a loss of signal to a router during a period of heavy traffic, the ATM

interface on the router might stop functioning. If the ATM interface stops

functioning, you must reboot the router to recover.

• On the ARE, BayRS does not release virtual channel connections when they

time out. To maintain the availability of VCCs for new activities, configure a

LAN emulation client (LEC) other than the router to release the inactive

VCCs.

• Setting ATM signal ports on a Switch and Router Conflict

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Avaya BayRS Version 15.4.2.0 Notice Page 52