LAN issues
Issue 3.4.1 June 2005
287
Trunk configuration
A trunk port on an Ethernet switch is one that is capable of forwarding Ethernet frames on
multiple VLANs through the mechanism of VLAN tagging. IEEE 802.1Q specifies the standard
method for VLAN tagging. Cisco also uses a proprietary method called ISL. Avaya products do
not interoperate with ISL.
A trunk link is a connection between two devices across trunk ports. This connection can be
between a router and a switch, between two switches, or between a switch and an IP
Telephone. Some form of trunking or forwarding multiple VLANs must be enabled to permit the
IP Telephone and the attached personal computer to appear on separate VLANs. The
commands in
Table 69
enable trunking.
Note that Cisco can remove VLANs from a trunk port. This is a highly desirable feature because
only two VLANs at most should appear on a trunk port that is connected to an IP Telephone.
That is, broadcasts from nonessential VLANs should not be permitted to bog down the link to
the IP Telephone. The pre-3.2 version of P330 code did not have the capability to clear off
unwanted VLANs. Enabling 802.1Q trunking enabled all the VLANs. Newer versions of P330
code can limit the VLANs on a trunk, but in doing so they alter the previous trunking behavior.
VLAN binding feature (P330 v3.2.8)
With both Cisco and the pre-3.2 P330 code, the default behavior of trunking is to permit all
VLANs. With the new P330 code, the default behavior is to permit only the port VLAN or the
native VLAN, and to block all other VLANs. Additional VLANs are added to a port using the
VLAN binding feature. In addition, the port does not need to be a trunk at all to forward multiple
VLANs. For one application, connecting to an Avaya IP Telephone, the port must not be a trunk
(do not issue the set trunk command).
Table 69: Administration commands for VLAN trunking
Avaya P33xT v3.2.8 and later
Cisco CatOS
set trunk <mod/port> dot1q
By default, only the port VLAN or
the native VLAN is enabled on the
trunk port. Another set of
commands is required to specify
other allowed VLANs.
set trunk <mod/port> nonegotiate dot1q
By default, all VLANs (1 to1005) are enabled
on the trunk port. VLANs can be selectively
removed with the command clear trunk
<mod/port> <vid>.
Содержание Application Solutions
Страница 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Страница 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Страница 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 74: ...Avaya Application Solutions platforms 74 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Страница 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 214: ...Voice quality network requirements 214 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 239: ...Reliability Issue 3 4 1 June 2005 239 Figure 69 S8700 Media Server in a high reliability configuration ...
Страница 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Страница 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 350: ...Implementing Communication Manager on a data network 350 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Страница 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Страница 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...