Chapter 12 Restrictions And Caveats In Cisco Ios Xe 3.9 Releases; Limitations And Restrictions - Cisco ASR 900 Series Release Notes

Restrictions and Caveats in Cisco IOS XE 3.9
Releases
This chapter provides information about restrictions and caveats in Cisco IOS XE 3.9 releases.
We recommend that you view the field notices for the current release to determine whether your software
Note
or hardware platforms are affected. You can access field notices at
http://www.cisco.com/en/US/support/tsd_products_field_notice_summary.html.
This chapter contains the following sections:
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Limitations and Restrictions

The following limitations apply to the Cisco ASR 903 Router in IOS XE Release 3.9(0)S and later:
TDM Limitation
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ATM IMA Limitation
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Bidirectional Forwarding Detection Limitations
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Note
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OL-26630-12
Limitations and Restrictions, page 1
Caveats in Cisco IOS XE 3.9S Releases, page 5
The configure replace command is not supported for TDM interfaces.
You can create a maximum of 16 IMA groups on each T1/E1 interface module.
The minimum supported timer value for software-based BFD sessions is 200 ms x 3 (using a
multiplier of 3). The router supports up to 64 offloaded BFD sessions using a 200 ms x 3 timer.
The Cisco ASR 903 Router supports hardware offloading of BFD echo mode packets for up to 255
sessions. The router handles additional BFD echo mode sessions in software.
You cannot convert more than 255 normal BFD sessions to echo mode BFD sessions; the router
reaches the offload limit and you must remove and reconfigure the remaining sessions.
The minimum supported timer value for offloaded BFD echo mode sessions is 3.3 ms.
C H A P T E R
Cisco IOS XE 3S Release Notes for the Cisco ASR 903 Router
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