Cisco 7600-ES20-GE3CXL-RF - Ethernet Services 20G Line Card Switch Instrukcja Użytkownika Pobierz pdf (Strona 97)

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Caveats for Cisco IOS Release 12.2(33)SRD through 12.2(33)SRD8

OL-10394-05 Rev. R0

Workaround: This is a negative test case and will never happen in practical setups as the MAC

addresses will not overlap. Also the network topology should ensure that the same subscriber MAC

address does not appear on more than one physical interface.

• CSCsx46415

Symptoms: Virtual Private LAN Services (VPLS) unicast traffic not flowing over the VC when

core-facing port is ESM20 line card.

Conditions: Core-facing port must be on the 9th slot or higher in a Cisco 7609 or Cisco 7613 chassis.

Also the VC neighbor scale should be very high on that VPLS VLAN.

Workaround: Use slots lower than 9.

• CSCsx49573

Symptoms: Three separate Cisco IOS Hypertext Transfer Protocol (HTTP) cross-site scripting

(XSS) vulnerabilities and a cross-site request forgery (CSRF) vulnerability have been reported to

Cisco by three independent researchers.

The Cisco Security Response is posted at the following link:

http://www.cisco.com/warp/public/707/cisco-sr-20090114-http.shtml

Conditions: See "Additional Information" section in the posted response for further details.

Workarounds: See "Workaround" section in the posted response for further details.

• CSCsx55152

Symptoms: Switch does not send TC trap if it is not a root bridge

Conditions: If switch is a root bridge, it generates TC trap when link goes both up and down. But if

switch is not a root bridge, it generates TC trap only when link goes up.

Workaround: There is no workaround.

• CSCsx58335

Symptoms: When relaying to multiple servers from an unnumbered interface, the DHCP relay sends

packets to all servers, even for packets where the client is in a RENEWING state unicasting to

attempt to reach a single server. ARP entries are retained for all offered addresses, even if the client

is ultimately using a different address. These extra ARP entries persist for several hours.

Conditions: The symptom is observed under the following conditions:

1. When relaying a DHCP packet on an unnumbered interface and the DHCP client is in a

renewing state (as determined by the fact that the packets are sent to the DHCP server which

allocated the address so that we do not end up giving the client a new address, which would then

interrupt the user sessions).

2. When the client is in any other state, or if we do not get a response from the DHCP server, the

packets are sent to all helper-addresses.

Workaround: Use Cisco IOS 12.4T images.

Further Problem Description: Only retain an ARP entry for the address that the DHCP client ACKs.

Do not retain addresses offered by DHCP servers which the client did not use in the ARP table.

• CSCsx67931

Symptoms: The no l2tp tunnel authentication command does not work at LNS.

Conditions: This symptom happens when the VPDN group that is used has a virtual-template x.

Workaround: Configure the no l2tp tunnel authentication command under virtual template.

• CSCsx81707

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